6.
A boatman can row 48 km downstream in 4 hr. If the speed of the current is 5 km/hr, then find in what time will he be able to cover 8 km upstream?
- A.6 h
- C.8 h
- B.4 h
- D.None of these
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
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| Speed of the current = 5 km/h | ||||||||||||||||||||||
| Let the boatman takes t hours to cover 8 km upstream. | ||||||||||||||||||||||
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7.
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 one hour fifteen minutes to cover the same distance. What was the average speed during the whole journey?
- A.40 mph
- C.55 mph
- B.48 mph
- D.50 mph
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
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8.
A man can row with the stream at 7 km/h and against the stream at 3 km/h. His soeed in still water is
- A.7 km/h
- C.6.5 km/h
- B.5 km/h
- D.None of these
- Answer & Explanation
- Report
Answer : [B]
Explanation :
Explanation :
| Speed of the man upstream = 7 km/h |
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| Speed of the man downstream = 3 km/h |
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9.
In a stream that is running at 2 km/h, a man goes 10 km upstream and comes back to the starting point in 55 minutes. Find the speed of the man in still water.
- A.28 km/h
- C.22 km/h
- B.20 km/h
- D.24 km/h
- Answer & Explanation
- Report
Answer : [C]
Explanation :
Explanation :
| Let the speed of the man in still water be x km/h. | |||||||||||||||
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10.
A boat goes 40 km upstream in 8 hours and 36 km downstream in 6 hours. The speed of the boat in still water in km/hr is
- A.5.5
- C.6.6
- B.4.5
- D.None of these
- Answer & Explanation
- Report
Answer : [A]
Explanation :
Explanation :
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