A person wins a 100m race by completing it in 12 seconds. The runner-up takes 12.5 seconds. By how many meters did the winner beat the runner-up? MCQ with Answer and Explanation
A person wins a 100m race by completing it in 12 seconds. The runner-up takes 12.5 seconds. By how many meters did the winner beat the runner-up?
A. 5 meters
B. 6 meters
C. 4 meters
D. 8 meters
Answer: Option A
Solution (By JKSSB Mock Tests)
Speed of runner-up = 100 / 12.5 = 8 m/s. When the winner crosses the finish line at 12 seconds, the distance covered by runner-up = 8 * 12 = 96 meters. Distance by which he lost = 100 - 96 = 5 meters.
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.
Two delivery vans start from a junction hub and track along perpendicular cross lanes. One runs at 24 km/h and the other at 32 km/h. Find the separation distance between them after 1 hour.
Explanation:
In 1 hour, the first van covers 24 km and the second covers 32 km. Direct line separation distance = sqrt(24^2 + 32^2) = sqrt(576 + 1024) = sqrt(1600) = 40 km.
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