Excluding stoppages, a transit truck travels at 75 km/h and including stoppages it travels at 62.5 km/h. How many minutes does the truck stop per hour? MCQ with Answer and Explanation
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Question #1
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A car covers a certain distance at a speed of 48 km/h in 50 minutes. With what speed should it run to decrease the time of journey by 10 minutes?
Correct Answer: Option D
Explanation:
Original time = 50 mins. New time = 50 - 10 = 40 mins. S1 * T1 = S2 * T2 => 48 * 50 = S2 * 40 => S2 = (48 * 50) / 40 = 60 km/h.
Original time = 50 mins. New time = 50 - 10 = 40 mins. S1 * T1 = S2 * T2 => 48 * 50 = S2 * 40 => S2 = (48 * 50) / 40 = 60 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A passenger train clears a station side signal pillar in exactly 12 seconds. If the length of the train is 180 meters, find its speed in km/h.
Correct Answer: Option C
Explanation:
Speed of train = 180 / 12 = 15 m/s. Converting to km/h = 15 * (18/5) = 54 km/h.
Speed of train = 180 / 12 = 15 m/s. Converting to km/h = 15 * (18/5) = 54 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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The speeds of two parallel running trains are in the ratio 5 : 4. Moving in opposite directions, they take 6 seconds each to pass a stationary signal post. Find the total time they take to cross each other completely.
Correct Answer: Option D
Explanation:
Let the speeds be 5x and 4x. Length of first train = 5x * 6 = 30x. Length of second train = 4x * 6 = 24x. Total passing distance = 30x + 24x = 54x. Relative speed = 5x + 4x = 9x. Time taken to cross each other = 54x / 9x = 6 seconds.
Let the speeds be 5x and 4x. Length of first train = 5x * 6 = 30x. Length of second train = 4x * 6 = 24x. Total passing distance = 30x + 24x = 54x. Relative speed = 5x + 4x = 9x. Time taken to cross each other = 54x / 9x = 6 seconds.
This question belongs to:
Maths
Time Speed and Distance
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