a river is flowing steadily with a speed of 1.5kmph. A boat goes against the stream with a speed of 15kmph. to cover a distance of 260km. What time will it take?
Answers
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Answer:
1. A man takes 20 minutes to row 12 km upstream which is a third more than the time he takes on his way downstream. What is his speed in still water?
A. 41 km/hr
B. 36 km/hr
C. 42 km/hr
D. 45 km/hr
Answer & Explanation
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2. How long will it take to row 20 km upstream if one can row 10 km in 10 minutes in still water and the same distance in 8 minutes with the stream?
A. 12 min
B. 13.33 min
C. 24 min
D. 26.67 min
Answer & Explanation

Q.3. A boat makes a return journey from point A to point B and back in 5 hours 36 minutes. One way it travels with the stream and on the return it travels against the stream. If the speed of the stream increases by 2 km/hr, the return journey takes 9 hours 20 minutes. What is the speed of the boat in still water? (The distance between A and B is 16 km.)
A. 5 km/hr
B. 3 km/hr
C. 7 km/hr
D. 9 km/hr
Answer & Explanation
Q.4. A boat travels from point A to B, a distance of 12 km. From A it travels 4 km downstream in 15 minutes and the remaining 8 km upstream to reach B. If the downstream speed is twice as high as the upstream speed, what is the average speed of the boat for the journey from A to B?
A. 10(2/3)km/hr
B. 9.6 km/hr
C. 11.16 km/hr
D. 10.44 km/hr
Answer & Explanation
Q.5. A man rows ‘k’ km upstream and back again downstream to the same point in H hours. The speed of rowing in still water is s km/hr and the rate of stream is r km/hr. Then
A. (s2-r2) =2sk /H
B. (r + s) = kH / (r -s)
C. rs = kH
D. None of the above