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QA – Placement Quizzes | Time Speed Distance | Question 10

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A train covers a journey of 4 stations connected to form a square at speeds of 20, 40, 60 and 80 km/hr. What is the average speed of train for this journey? (A) 38.4 (B) 100 (C) 80.4 (D) 160

Answer: (A)

Explanation: Speed = distance/time Say, side of square = y km time t1 = y/20 t2 = y/40, t3 = y/60 and t4 = y/80 Total time = (12+6+4+3)y/240 speed = total distance/total time = 4y/(t1+t2+t3+t4) = 4y*240/25y = 38.4 km/hr

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Last Updated : 28 Jun, 2021
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