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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:

14 km
15 km
16 km
17 km

Correct Answer: 16 km

Explanation:

Let the distance travelled on foot be x km.

Then, distance travelled on bicycle = (61 -x) km.

So,	x	+	(61 -x)	= 9
	4		9

⟹ 9x + 4(61 -x) = 9 x 36

⟹ 5x = 80

⟹ x = 16 km.

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