A man travels some distance at a speed of 28 km/hr and returns at a speed of 21 km/hr. If the total time taken by him is 4 hrs 30 min, the distance is

Let the distance travelled by a man be D km According to the question, Total time taken = 4 hrs 30 min = 4(30/60) = 9/2 hours Total time = T_{1} + T_{2} D/28 + D/21 = 9/2 (3D + 4D)/84 = 9/2 7D/84 = 9/2 D = 54 km

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