An airplane covers a certain distance at a speed of 240 km/h in 5 hours. To cover the same distance in 1 hour 40 minutes, it must travel at a speed of: MCQ with Answer and Explanation
An airplane covers a certain distance at a speed of 240 km/h in 5 hours. To cover the same distance in 1 hour 40 minutes, it must travel at a speed of:
A. 720 km/h
B. 640 km/h
C. 750 km/h
D. 600 km/h
Answer: Option A
Solution (By JKSSB Mock Tests)
Distance = Speed * Time = 240 * 5 = 1200 km. New time = 1 hour 40 minutes = 5/3 hours. New speed = Distance / New Time = 1200 / (5/3) = 1200 * 3 / 5 = 720 km/h.
A person runs at 8 km/h instead of 6 km/h and consequently covers 10 km more in the same timeframe. Find the baseline distance covered at his normal speed.
Explanation:
Let duration be t hours. Distance difference = 8t - 6t = 2t = 10 km => t = 5 hours. Distance handled at normal speed (6 km/h) = 6 * 5 = 30 km.
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