A Man travelled a distance of 51 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) 16 km B) 24 km C) 12 km D) 10 km E) None of these
Explanation:   Let the time in which he travelled on foot = x hour   Time for travelling on bicycle = (9 - x) hr   Distance = Speed * Time, and Total distance = 51 km   So,   4x + 9(9-x) = 51   =&gt; 5x = 30   =&gt; x = 6   So distance traveled on foot = 4(6) = 24 km   Answer: Option 24 km
<result>B</result>
A Man travelled a distance of 51 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?