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:

Question

A. 14 km

B. 15 km

C. 16 km

D. 17 km

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Correct Answer :

C. 14 km

Let the distance travelled on foot be x km.
Then, distance travelled on bicycle = (61 -x) km.

S o, \frac{x}{4} + \frac{(61 - x)}{9} = 9

\Rightarrow 9 x + 4 (61 - x) = 9 x 36

\Rightarrow 5 x = 80

\Rightarrow x = 16 k m .

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