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A train covers a distance of 1200 km. at...

A train covers a distance of 1200 km. at x `km//hr`. Had the speed been (x+10)`km//hr` the time taken to cover same distance would have been reduced by 10 hours. The value of x is :

A

64

B

48

C

40

D

30

Text Solution

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The correct Answer is:
D
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Knowledge Check

  • A car goes a distance at a speed of 60km/hour and returns the same distance at a speed of 40 km/hour. The average speed of the car is

    A
    48 km/hour
    B
    50 km/hour
    C
    52.6 km/hour
    D
    54 km/hour

  • The ratio of the speeds of three cars is 2:3:4. The ratio of the time taken by the cars of cover the same distance is

    A
    `2:3:4`
    B
    `4:3:6`
    C
    `3:4:6`
    D
    `6:4:3`

  • A boy goes to school from him home at a speed of x km/hr. and comes back at a speed of y km/hr. then the average speed of the boy is given by

    A
    `(x+y)/2`km/hr
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    `sqrtx` km/hr
    C
    `(2xy)/(x+y)` km/hr
    D
    Any of these

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