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. 600 km/h
B. 750 km/h
C. 720 km/h
D. 640 km/h
Answer: Option C
Solution (By JKExamLibrary)
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 covers a distance in 40 minutes if he drives at an average speed of 45 km/h. At what speed must he drive to reduce the time of journey to 30 minutes?
A car covers a distance of 180 km at a uniform speed. If the speed is increased by 10 km/h, the journey takes 3 hours. Find the initial speed of the car.
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