How much speed does car R need to gain in order to cover twice the distance in 5/3 of the original time taken?

16 m/s
28 m/s
12 m/s
24 m/s

Correct answer: 24 m/s

Solution

Car R’s original speed is 3000/150 = 20 m/s. To cover double the distance in 5/3 of the original time, the required speed becomes 24 m/s.

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