A Man travelled a distance of 61 km in 9 hours. He travelled partly on foot at 4 km/hr and partly on bicycle at 9 km/hr. What is the distance travelled on foot?	Choose the correct choice from the following answers.
A) 33
B) 38
C) 16
D) 87
E) 127
Let the time in which he travelled on foot = x hr   Then the time in which he travelled on bicycle = (9 - x) hr   distance = speed x time   ⇒4x+9(9−x)=61⇒4x+81−9x=61⇒5x=20⇒x=4⇒ distance travelled on foot = 4x=4×4=16 km   Answer : 16
<result>C</result>
A Man travelled a distance of 61 km in 9 hours. He travelled partly on foot at 4 km/hr and partly on bicycle at 9 km/hr. What is the distance travelled on foot?