A fisherman rows 20 km downstream in 2 hours and 15 km upstream in 3 hours. Find the net speed of the boat in still water. MCQ with Answer and Explanation
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Question #1
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A boat rowed downstream covers 40 km in 4 hours and manages 20 km upstream in 4 hours. Find the baseline speed of the boat in still water.
Correct Answer: Option D
Explanation:
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 20 / 4 = 5 km/h. Speed in still water = (10 + 5) / 2 = 7.5 km/h.
Downstream speed = 40 / 4 = 10 km/h. Upstream speed = 20 / 4 = 5 km/h. Speed in still water = (10 + 5) / 2 = 7.5 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 120 meters long crosses an electrical signal pole in 6 seconds. Find its speed in km/h.
Correct Answer: Option D
Explanation:
Speed = 120 / 6 = 20 m/s. Converting to km/h = 20 * (18/5) = 72 km/h.
Speed = 120 / 6 = 20 m/s. Converting to km/h = 20 * (18/5) = 72 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Excluding stoppages, a bus travels at 54 km/h and including stoppages it travels at 45 km/h. How many minutes does the bus stop per hour?
Correct Answer: Option B
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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