A motorboat covers 12 km upstream and returns back to the starting jetty in 3 hours. If the speed of the boat in still water is 9 km/h, find the speed of the river current. MCQ with Answer and Explanation
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Question #1
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A train 240 meters long passes a pole in 24 seconds. How long will it take to pass a platform 650 meters long?
Correct Answer: Option A
Explanation:
Speed of train = 240 / 24 = 10 m/s. Total distance to pass platform = 240 + 650 = 890 meters. Time taken = 890 / 10 = 89 seconds.
Speed of train = 240 / 24 = 10 m/s. Total distance to pass platform = 240 + 650 = 890 meters. Time taken = 890 / 10 = 89 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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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.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Excluding stoppages, the speed of an intercity bus is 54 km/h and including stoppages it is 45 km/h. How many minutes does the bus stop per hour?
Correct Answer: Option D
Explanation:
Stoppage time per hour = (54 - 45) / 54 = 9 / 54 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
Stoppage time per hour = (54 - 45) / 54 = 9 / 54 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
This question belongs to:
Maths
Time Speed and Distance
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