The speed of two runners are in the ratio 3 : 5. If the first runner takes 40 seconds to complete a loop, how much time does the second runner take? MCQ with Answer and Explanation
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Question #1
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A man covers 1/3 of his total journey at 40 km/h and the remaining 2/3 at 80 km/h. Find his average speed for the entire journey.
Correct Answer: Option C
Explanation:
Let total distance be 120 km. First part = 40 km; Time = 40 / 40 = 1 hour. Remaining part = 80 km; Time = 80 / 80 = 1 hour. Total distance = 120 km, Total time = 2 hours. Average speed = 120 / 2 = 60 km/h.
Let total distance be 120 km. First part = 40 km; Time = 40 / 40 = 1 hour. Remaining part = 80 km; Time = 80 / 80 = 1 hour. Total distance = 120 km, Total time = 2 hours. Average speed = 120 / 2 = 60 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A train 120 meters long passes an active crossing signal point in 6 seconds flat. Find the time interval needed to clear a station platform 240 meters long.
Correct Answer: Option A
Explanation:
Speed of train = 120 / 6 = 20 m/s. Total distance to clear platform = 120 + 240 = 360 meters. Time required = 360 / 20 = 18 seconds.
Speed of train = 120 / 6 = 20 m/s. Total distance to clear platform = 120 + 240 = 360 meters. Time required = 360 / 20 = 18 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A train running at 54 km/h crosses a bridge 150 meters long in 18 seconds. Find the length of the train.
Correct Answer: Option A
Explanation:
Speed = 54 * (5/18) = 15 m/s. Total distance in 18 seconds = 15 * 18 = 270 meters. Length of train = 270 - 150 = 120 meters.
Speed = 54 * (5/18) = 15 m/s. Total distance in 18 seconds = 15 * 18 = 270 meters. Length of train = 270 - 150 = 120 meters.
This question belongs to:
Maths
Time Speed and Distance
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