A crew row a boat 24 km upstream and 36 km downstream, taking 4 hours for each separate direction. Find the speed of the current stream. MCQ with Answer and Explanation
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Question #1
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A train 160 meters long passes a signal pole in 8 seconds. Find the time it takes to completely cross a platform 320 meters long.
Correct Answer: Option B
Explanation:
Speed of train = 160 / 8 = 20 m/s. Total distance to pass platform = 160 + 320 = 480 meters. Time required = 480 / 20 = 24 seconds.
Speed of train = 160 / 8 = 20 m/s. Total distance to pass platform = 160 + 320 = 480 meters. Time required = 480 / 20 = 24 seconds.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A mechanic wheel tracks 3000 revolutions to bridge a course distance of 2640 meters. Find the radius size of the wheel.
Correct Answer: Option A
Explanation:
Distance wrapped in 1 turn revolution = 2640 / 3000 = 0.88 meters = 88 cm. Circumference = 2 * (22/7) * r = 88 cm => (44/7) * r = 88 => r = 14 cm.
Distance wrapped in 1 turn revolution = 2640 / 3000 = 0.88 meters = 88 cm. Circumference = 2 * (22/7) * r = 88 cm => (44/7) * r = 88 => r = 14 cm.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A van moves at 45 km/h for 2 hours and then tracks at 55 km/h for the next 3 hours. Find the net average speed for the total route.
Correct Answer: Option C
Explanation:
Distance 1 = 45 * 2 = 90 km. Distance 2 = 55 * 3 = 165 km. Total distance = 255 km. Total time = 5 hours. Average speed = 255 / 5 = 51 km/h.
Distance 1 = 45 * 2 = 90 km. Distance 2 = 55 * 3 = 165 km. Total distance = 255 km. Total time = 5 hours. Average speed = 255 / 5 = 51 km/h.
This question belongs to:
Maths
Time Speed and Distance
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