A man cover a distance of 61 km in 9 hours. He first travelled on foot @ 4 km/hr and on bicycle @ 9 km/hr. The distance covered by foot is ?

A) 11 km

B) 16 km

C) 13 km

D) 15 km

Assume that the distance covered by foot is x km.

Then distance covered by bicycle = (61 - x) km.

so x/4 + (61 - x)/9 = 9.

9x + 4(61 - x) = 9 * 36

5x = 80

x = 16 km.

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