Question
Parag starts chasing a Vipul, 6 hours after the Vipul
starts running. Parag takes 7 hours to catch the Vipul. If the average speed of the Parag is 39 km/hr, find the average speed of the Vipul?Solution
Parag catches up to Vipul in 7 hours at a speed of 39 km/hr. So, the distance Parag covers is 39×7 = 273 km. Vipul was running for 13 hours total (6 hours before Parag started + 7 hours while being chased). Since Vipul also covered 273 km, his average speed is (273km/13hr) = 21 km/hr Vipul's average speed is 21 km/hr.
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