A car moves a distance of 200 𝑚. It covers first half of the distance at speed 60 𝑘𝑚ℎ−1 and the second half at speed 𝑣. If the average speed is 40 𝑘𝑚ℎ −1 , the value of 𝑣 is

Question : A car moves a distance of 200 𝑚. It covers first half of the distance at speed 60 𝑘𝑚ℎ−1 and the second half at speed 𝑣. If the average speed is 40 𝑘𝑚ℎ −1 , the value of 𝑣 is

(A) 30kmh^{-1}

(B) 13kmh^{-1}

(C) 60kmh^{-1}

(D) 40kmh^{-1}

Answer : option (A)

Solution :

A car moves a distance of 200 𝑚. It covers first half of the distance at speed 60 𝑘𝑚ℎ−1 and the second half at speed 𝑣. If the average speed is 40 𝑘𝑚ℎ −1 , the value of 𝑣 is
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