Q.

A vehicle travels 4 km with speed of 3 km/h and another 4 km with speed of 5 km/h, then its average speed is           [2023]

1 4.25 km/h  
2 3.50 km/h  
3 4.00 km/h  
4 3.75 km/h  

Ans.

(4)

2Vav=13+15=815

 Vav=154=3.75 km/h