Since both of them are travelling the same distance, so their speeds will be inversely proportional to time. Ratio of speeds = 2 : 3 Ratio of time = 3 : 2 A takes 10 minutes more than B. 3x – 2x = 10 minutes A’s time = 30 minutes A covers the distance in 30 minutes, if his speed is x. ⇒ He will cover the same distance in 15 minutes, if his speed doubles, i.e. 2x.