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A person travelled at 80 km/h from x toy, from y to x at 60 km/h and again travelled to y at a speed of 30 km/h find the average speed of all journey?

A56 km/h

B50 km/h

C48 km/h

D16 km/h

Answer:

C. 48 km/h

Read Explanation:

Average speed= 3xyz/(xy + yz + xz) = 3 × 80 × 60 × 30/(80×60 + 60 × 30 + 80 × 30) = 48 km/hr


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