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4

A farmer travelled a distance of 61 km in 9 hours. He travelled partly on foot @ 4 km/hr and partly on bicycle @ 9 km/hr. The distance travelled on foot is:

A. 14 km

B. 15 km

C. 16 km

D. 17 km

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Correct Answer :

C. 16 km


Let the distance travelled on foot be x km.
Then, distance travelled on bicycle = (61 -x) km.
So, x4 + (61 -x)9 = 9
⇒9x + 4(61 -x) = 9 x 36
⇒5x = 80
⇒x = 16 km.

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