Mohan finishes a journey by scooter in 5 hours. He travels the first half of the journey at 30 km/h and the second half of the journey at 20 km/h. The distance covered by him is:

Solution (By Examveda Team)

$$\eqalign{ & \frac{x}{{30}} + \frac{x}{{20}} = 5 \cr & \frac{{2x + 3x}}{{60}} = 5 \cr & x = 60 \cr & {\text{Total distance}} = 2x \cr & = 2 \times 60 \cr & = 120{\text{ km}} \cr} $$