Home
Class 7
MATHS
A man in a train notices that he can ...

A man in a train notices that he can count 21 telephone posts in one minute. If they are known to be 50 metres apart, then at what speed is the train travelling? `55\ k m//h r` b. `\ 60\ k m//h r` c. `57\ k m//h r` d. `63\ k m//h r`

A

57 km/hr

B

60 km/hr

C

63 km/hr.

D

55 km/hr

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • DISTANCE TIME AND SPEED

    S CHAND IIT JEE FOUNDATION|Exercise SELF ASSESSMENT SHEET -14 |10 Videos

  • DISTANCE TIME AND SPEED

    S CHAND IIT JEE FOUNDATION|Exercise QUESTION BANK -14(a) |30 Videos

  • DECIMALS

    S CHAND IIT JEE FOUNDATION|Exercise SELF ASSESSMENT SHEET |10 Videos

  • FACTORISATION

    S CHAND IIT JEE FOUNDATION|Exercise Self Assessment Sheet - 8 |10 Videos

Similar Questions

Explore conceptually related problems

A man in train notices that he can count 21 telephone posts in one minute. If they are known to be 50 metres apart, then at what speed is the train travelling?

A man in a train notices that he can count 21 telephone posts in one minute.If they are known to be 50 metres apart,then at what speed is the train travelling? 55backslash km/hr b.backslash60backslash km/hr c.57backslash km/hrd.63backslash km/hr

A train 125 m long passes a man, running at 5 kmph in the same direction in which the train is going, in 10 seconds. The speed of the train is: 45 k m//h r b. 50 k m//h r c. 54 k m//h r d. 55 k m//h r

A man's speed with the current is 15 km / hr and the speed of the current is 2.5 km/ hr. The man's speed against the current is: 8. 5\ k m//h r b. \ 9\ k m//h r c. 10\ k m//h r d. 12. k m//h r

A train travels at a speed of 30 km/hr for 12 minutes and at a speed of 4 km/hr for the next 8 minutes. The average speed of the train for this journey is 30 k m//h r b. 36 k m//h r c. 37. k m//h r d. 48 k m//h r

Two trains start simultaneously (with uniform speeds) from two stations 270 km apart, each to the opposite station; they reach their destinations in 6 1/4 hours and 4 hours after they meet. The rate at which the slower train travels is 16 k m//h r b. 24 k m//h r c. 25 k m//h r d. 30 k m//h r

A journey of 192 km between two cities takes 2 hours less by a fast train than by a slow train. If the average speed of the slow train is 16 km/hr less than that of the fast train, then the average speed of the fast train is 32 k m//h r b. 48 k m//h r c. 36 k m//h r d. 64 k m//h r

A man rows to a place 48 km distant and back in 14 hours. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is : 1 k m//h r b. 1. 8 k m//h r c. 1. 5 k m//h r d. 3. 5 k m//h r

A car covers the first 39 kms of its journey I 45 minutes and covers the remaining 25 km in 3 minutes. What is the average speed of the car? 40 k m//h r b. 48 k m//h r c. 49 k m//h r d. 64 k m//h r e. none of these

S CHAND IIT JEE FOUNDATION-DISTANCE TIME AND SPEED -QUESTION BANK -14(b)
  1. A train 110 m long takes three seconds to pass a standing man. How lon...

    Text Solution

    |

  2. A train speeding at 120 km/hr crosses an electric pole in 9 seconds an...

    Text Solution

    |

  3. A train passes a pole in 15 seconds and a platform 100 m long in 25 se...

    Text Solution

    |

  4. A train passes a platform 90 m long in 30 seconds and a man standin...

    Text Solution

    |

  5. Sabarmati express takes 18 seconds to pass completely through a statio...

    Text Solution

    |

  6. A train, 150 m long, takes 30 seconds to cross ' bridge 500 m long....

    Text Solution

    |

  7. A 120 metre long train is running at a speed of 90 k/her. It will c...

    Text Solution

    |

  8. A passenger train runs at the rate of 80 kmph. It starts from the s...

    Text Solution

    |

  9. A train X starts from a place at a speed of 50 km/hr. After one hour, ...

    Text Solution

    |

  10. A man in a train notices that he can count 21 telephone posts in on...

    Text Solution

    |

  11. The distance of the sun from the earth is one hundred forty million fo...

    Text Solution

    |

  12. A man covered a distance of 2000 km in 18 hours partly by bus at 72 km...

    Text Solution

    |

  13. A man takes 4 h 20 minutes in walking to a certain place and riding ba...

    Text Solution

    |

  14. A car covers 4 successive 3 km stretches at speeds of 10 km/hr, 20 km/...

    Text Solution

    |

  15. Moving at (5 ) /(6 ) of its usual speed, a train is 10 minutes late....

    Text Solution

    |

  16. If a train runs at 40 kmph, it reaches its destination late by 11 m...

    Text Solution

    |

  17. The distance between two cities A and B is 330 km . A train starts fro...

    Text Solution

    |

  18. A train passes a station platform in 36 second, a man standing on t...

    Text Solution

    |

  19. A motor car starts with a speed of 70 km/hr with its speed increasing ...

    Text Solution

    |

  20. A person sets to cover a distance of 12 km in 45 minutes. If he covers...

    Text Solution

    |