Question

A man covers 18 km in 3 hrs and next 21 km in 3 and half hour. Find his average

speed​

Answer 1

Answer:Let the time he walks be x hours  

From the given condition

3(x)+9(3−x)=15⟹6x=12⟹x=2

So the time he runs is 3−2=1 hour

Distance covered by running is 1×9=9 km

Step-by-step explanation: