A car covers a distance of 180 km in 3 hours. What should be the increase in its speed to cover the same distance in 2 hours? MCQ with Answer and Explanation
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Question #1
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Walking at 3/5 of his normal speed, a person is 20 minutes late to his destination. What is his normal time?
Correct Answer: Option A
Explanation:
New speed = 3/5 of normal speed => New time = 5/3 of normal time. Difference = 2/3 of normal time = 20 minutes. Normal time = (20 * 3) / 2 = 30 minutes.
New speed = 3/5 of normal speed => New time = 5/3 of normal time. Difference = 2/3 of normal time = 20 minutes. Normal time = (20 * 3) / 2 = 30 minutes.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 240 meters long passes a static utility pole in 12 seconds. Find the time it takes to completely pass a platform of length 360 meters.
Correct Answer: Option A
Explanation:
Speed of train = 240 / 12 = 20 m/s. Total distance to pass platform = 240 + 360 = 600 meters. Time taken = 600 / 20 = 30 seconds.
Speed of train = 240 / 12 = 20 m/s. Total distance to pass platform = 240 + 360 = 600 meters. Time taken = 600 / 20 = 30 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A boat covers 36 km downstream in 3 hours and maps the identical stretch upstream in 6 hours. Find the speed of the river stream current.
Correct Answer: Option C
Explanation:
Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 36 / 6 = 6 km/h. Speed of stream current = (12 - 6) / 2 = 3 km/h.
Downstream speed = 36 / 3 = 12 km/h. Upstream speed = 36 / 6 = 6 km/h. Speed of stream current = (12 - 6) / 2 = 3 km/h.
This question belongs to:
Maths
Time Speed and Distance
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