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A boat, while going downstream in a r...

A boat, while going downstream in a river covered a distance of 50 miles at an average speed of 60 miles per hour. While returning, because of the water resistance, it took 1 hour 15 minutes to cover the same distance. What was the average speed during the whole journey? `40\ m p h` b. `48\ m p h` c. `50\ m p h` d. `55\ m p h`

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RS AGGARWAL-BOATS AND STREAMS-All Questions
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  8. If a man rows at the rate of 5 kmph in still water and his rate aga...

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  11. The speed of a boat in still water is 15 km / hr and the rate of cu...

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  13. A boat takes 19 hours for travelling downstream from point A to poi...

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  14. P, Q and R are three towns on a river which flows uniformly. Q is equi...

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  15. A man can row 9 1/3\ kmph in still water and finds that it takes him t...

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  16. A boat takes 8 hours to cover a distance while travelling upstream,...

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  17. A motor boat can travel at 10 km/hr in still water. It travelled 91...

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  18. The speed of a boat in still water is 10 km /hr. If it can travel 2...

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  19. A boat takes 90 minutes less to travel 36 miles downstream than to ...

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