A motorboat covers 16 km downstream in 1 hour and covers the same distance upstream in 2 hours. Find the speed of the boat in still water. MCQ with Answer and Explanation
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Question #1
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A boat can row 10 km/h in still water. If the river velocity is 2 km/h, find the distance covered downstream by the boat in 30 minutes.
Correct Answer: Option D
Explanation:
Downstream speed = 10 + 2 = 12 km/h. Time = 30 minutes = 0.5 hour. Distance covered = Speed * Time = 12 * 0.5 = 6 km.
Downstream speed = 10 + 2 = 12 km/h. Time = 30 minutes = 0.5 hour. Distance covered = Speed * Time = 12 * 0.5 = 6 km.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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Excluding stoppages, a bus travels at 60 km/h and including stoppages it travels at 50 km/h. How many minutes does the bus stop per hour?
Correct Answer: Option A
Explanation:
Stoppage time per hour = (60 - 50) / 60 = 10 / 60 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
Stoppage time per hour = (60 - 50) / 60 = 10 / 60 = 1/6 hour. In minutes = (1/6) * 60 = 10 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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Walking at 7/9 of his usual speed, an accountant is 20 minutes late to his branch. What is his usual time to reach the destination?
Correct Answer: Option D
Explanation:
New speed = 7/9 of usual speed => New time = 9/7 of usual time. Difference = 2/7 of usual time = 20 minutes. Therefore, 1/7 of usual time = 10 minutes => Usual time = 70 minutes.
New speed = 7/9 of usual speed => New time = 9/7 of usual time. Difference = 2/7 of usual time = 20 minutes. Therefore, 1/7 of usual time = 10 minutes => Usual time = 70 minutes.
This question belongs to:
Maths
Time Speed and Distance
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