The speed of two runners are in the ratio 3 : 4. If the first runner takes 36 seconds to complete a loop, how much time does the second runner take? MCQ with Answer and Explanation
The speed of two runners are in the ratio 3 : 4. If the first runner takes 36 seconds to complete a loop, how much time does the second runner take?
A. 25 seconds
B. 30 seconds
C. 32 seconds
D. 27 seconds
Answer: Option D
Solution (By JKSSB Mock Tests)
Ratio of speeds = 3:4, so ratio of times taken = 4:3. Given 4 parts = 36 seconds => 1 part = 9 seconds. Time taken by the second runner = 3 parts = 3 * 9 = 27 seconds.
Explanation:
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.
A car covered a distance of 400 km at a uniform speed. If the uniform speed index is lowered by 10 km/h, the journey takes 2 hours longer. Find the original speed.
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