A boat covers 36 km downstream in 3 hours and maps the identical stretch upstream in 6 hours. Find the speed of the river stream current. MCQ with Answer and Explanation
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Question #1
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Excluding stoppages, the speed of a train is 90 km/h and including stoppages it is 75 km/h. How many minutes does the train stop per hour?
Correct Answer: Option C
Explanation:
Stoppage time per hour = (90 - 75) / 90 = 15 / 90 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
Stoppage time per hour = (90 - 75) / 90 = 15 / 90 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A swimmer logs 36 km downstream in 3 hours and tracks the identical course line upstream in 9 hours. Find the net velocity of the stream.
Correct Answer: Option C
Explanation:
Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 36 / 9 = 4 km/h. Speed of stream current = (12 - 4) / 2 = 8 / 2 = 4 km/h.
Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 36 / 9 = 4 km/h. Speed of stream current = (12 - 4) / 2 = 8 / 2 = 4 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A man can walk a distance in 4 hours and ride back in 3 hours. If he walks both ways, he takes 8 hours. How much time will he take if he rides both ways?
Correct Answer: Option B
Explanation:
Let walking time one way be W and riding time one way be R. W + R = 7 hours. Walking both ways: 2W = 8 => W = 4 hours. Substituting W in first equation: 4 + R = 7 => R = 3 hours. Riding both ways: 2R = 2 * 3 = 6 hours.
Let walking time one way be W and riding time one way be R. W + R = 7 hours. Walking both ways: 2W = 8 => W = 4 hours. Substituting W in first equation: 4 + R = 7 => R = 3 hours. Riding both ways: 2R = 2 * 3 = 6 hours.
This question belongs to:
Maths
Time Speed and Distance
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