A boat can row 18 km/h in still water and the speed of the current is 2 km/h. Find the time taken to row 80 km downstream. MCQ with Answer and Explanation
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Question #1
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In a 400-meter race, A finishes in 45 seconds and B finishes in 50 seconds. By what distance does A beat B?
Correct Answer: Option D
Explanation:
Speed of B = 400 / 50 = 8 m/s. Distance covered by B when A crosses the finish line at 45 seconds = 8 * 45 = 360 meters. Winning margin = 400 - 360 = 40 meters.
Speed of B = 400 / 50 = 8 m/s. Distance covered by B when A crosses the finish line at 45 seconds = 8 * 45 = 360 meters. Winning margin = 400 - 360 = 40 meters.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A man rows downstream 36 km in 3 hours and upstream 18 km in 3 hours. Find the speed of the boat in still water.
Correct Answer: Option A
Explanation:
Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 18 / 3 = 6 km/h. Speed in still water = (12 + 6) / 2 = 9 km/h.
Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 18 / 3 = 6 km/h. Speed in still water = (12 + 6) / 2 = 9 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A runner completes a 200-meter race in 25 seconds. Find his speed in km/h.
Correct Answer: Option A
Explanation:
Speed in m/s = 200 / 25 = 8 m/s. In km/h = 8 * (18/5) = 144 / 5 = 28.8 km/h.
Speed in m/s = 200 / 25 = 8 m/s. In km/h = 8 * (18/5) = 144 / 5 = 28.8 km/h.
This question belongs to:
Maths
Time Speed and Distance
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