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If a boat goes 7 km upstream in 42 minut...

If a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, the speed of the boat in still water is :

A

9 km/hr

B

13 km/hr

C

8 km/hr

D

21 km/hr

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The correct Answer is:
B
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MAHENDRA-BOAT & STREAM-EXERCISE
  1. A man takes twice as long to row a distance against the stream as to r...

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  2. A boat running upstream takes 8 hours 48 minutes to cover a certain di...

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  3. If a boat goes 7 km upstream in 42 minutes and the speed of the stream...

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  4. The speed of boat in downstream is 15 km/hr and the speed of the curre...

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  5. A man rows at the rate of 5 kmph in still water and his rate against t...

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  6. Boat can travel with a speed of 13 km/hr in still water. If the speed ...

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  7. A boatman can row 2 km against the stream in 20 minutes and return i...

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  8. A boatman can row 48 km downstream in 4 hr. If the speed of the curren...

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  9. A man can row at a speed of 10 km/hr in still water to a certain upstr...

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  10. A boat travels upstream from B to A and downstream from A to B in 3 ...

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  11. A boat travels 2 km upstream in a stream flowing at 3 km/hr and then r...

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  12. A man swimming in a stream which flows 1(1)/(2) km/hr finds that in a ...

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  13. A boat travels upstream from B to A and downstream from A to B in 3 ...

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  14. A man rows upstream 12 km and downstream 28 km taking 5 hours each tim...

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  15. Twice the speed downstream is equal to the thrice the speed upstream, ...

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  16. A man can swim 3 km/hr in still water. If the velocity of the stream ...

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  17. A boat covers 24 km upstream and 36 km downstream in 6 hours wh...

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  18. A boatman goes 2 km against the current of the stream in 1 hour and go...

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  19. The speed of boat in still water is 8 km/h. The boat goes 6km & back t...

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  20. A boat travels 40 km. up stream and 55 km. down stream in 13 hours. It...

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