A man can row 8 km/h in still water. If the river current flows at 2 km/h, it takes him 3.2 hours to row to a place and back. How far is the place? MCQ with Answer and Explanation
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Question #1
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A crew can row 40 km downstream in 4 hours and 20 km upstream in 5 hours. Find the speed of the stream.
Correct Answer: Option A
Explanation:
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of the stream = (Downstream speed - Upstream speed) / 2 = (10 - 4) / 2 = 6 / 2 = 3 km/h.
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of the stream = (Downstream speed - Upstream speed) / 2 = (10 - 4) / 2 = 6 / 2 = 3 km/h.
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Maths
Time Speed and Distance
Question #2
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Excluding stoppages, a bus travels at 60 km/h and including stoppages it travels at 50 km/h. How many minutes does the bus stop per hour?
Correct Answer: Option C
Explanation:
Stoppage time per hour = (60 - 50) / 60 = 10 / 60 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
Stoppage time per hour = (60 - 50) / 60 = 10 / 60 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
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Maths
Time Speed and Distance
Question #3
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A boat crew rows 30 km upstream and 50 km downstream, taking exactly 5 hours for each independent passage. Find the speed of the current stream.
Correct Answer: Option D
Explanation:
Upstream speed = 30 / 5 = 6 km/h. Downstream speed = 50 / 5 = 10 km/h. Speed of current stream = (Downstream speed - Upstream speed) / 2 = (10 - 6) / 2 = 2 km/h.
Upstream speed = 30 / 5 = 6 km/h. Downstream speed = 50 / 5 = 10 km/h. Speed of current stream = (Downstream speed - Upstream speed) / 2 = (10 - 6) / 2 = 2 km/h.
This question belongs to:
Maths
Time Speed and Distance
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