A thief escapes at 2:00 PM at a speed of 40 km/h. The owner follows him at 3:30 PM at a speed of 50 km/h. At what time will the owner catch the thief? MCQ with Answer and Explanation
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Question #1
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A boat covers 20 km downstream in 2 hours and the same distance upstream in 5 hours. Find the speed of the stream.
Correct Answer: Option A
Explanation:
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of stream = (10 - 4) / 2 = 6 / 2 = 3 km/h.
Downstream speed = 20 / 2 = 10 km/h. Upstream speed = 20 / 5 = 4 km/h. Speed of stream = (10 - 4) / 2 = 6 / 2 = 3 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A boatman can row 12 km/h in still water. If the river velocity index tracks at 2 km/h, find the time parameter required by the boat hull to row 40 km upstream.
Correct Answer: Option A
Explanation:
Upstream speed = 12 - 2 = 10 km/h. Time required = Distance / Upstream Speed = 40 / 10 = 4 hours.
Upstream speed = 12 - 2 = 10 km/h. Time required = Distance / Upstream Speed = 40 / 10 = 4 hours.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A boat can row 10 km/h in still water and the speed of the current is 2 km/h. Find the time taken to row 24 km upstream.
Correct Answer: Option B
Explanation:
Upstream speed = 10 - 2 = 8 km/h. Time taken = 24 / 8 = 3 hours.
Upstream speed = 10 - 2 = 8 km/h. Time taken = 24 / 8 = 3 hours.
This question belongs to:
Maths
Time Speed and Distance
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