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Time and Distance - General Aptitude

Q1:

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

ANS:C - 16 km

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.