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:

Answer: Option C

Solution

Answer: Option C

Solution:

$$\begin{array}{rl}& \frac{x}{30}+\frac{x}{20}=5\\ & \frac{2x+3x}{60}=5\\ & x=60\\ & \text{Total distance}=2x\\ & =2\times 60\\ & =120\text{ km}\end{array}$$