A boy walks to his school at a distance of 6𝑘𝑚 with constant speed of 2.5 𝑘𝑚/ℎ𝑜𝑢𝑟 and walks back with a constant speed of 4 𝑘𝑚/ℎ𝑟. His average speed for round trip expressed in 𝑘𝑚/ℎ𝑜𝑢𝑟, is

April 11, 2022

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Physics Problems

Question : A boy walks to his school at a distance of 6𝑘𝑚 with constant speed of 2.5 𝑘𝑚/ℎ𝑜𝑢𝑟 and walks back with a constant speed of 4 𝑘𝑚/ℎ𝑟. His average speed for round trip expressed in 𝑘𝑚/ℎ𝑜𝑢𝑟, is

(A) 24/13

(B) 40/13

(D) 1/2

Answer : option (B)

Solution :

A boy walks to his school at a distance of 6𝑘𝑚 with constant speed of 2.5 𝑘𝑚/ℎ𝑜𝑢𝑟 and walks back with a constant speed of 4 𝑘𝑚/ℎ𝑟. His average speed for round trip expressed in 𝑘𝑚/ℎ𝑜𝑢𝑟, is