A man is walking at a speed of 10 kmph. After every km, he takes rest for 5 minutes. How much time will he take to cover a distance of 5 km ?

Answer: Option B

Time taken by man if he did not stop :
$$\begin{array}{rl}& =\frac{5\text{ km}}{10\text{ kmph}}\\ & =\frac{1}{2}\text{hr}\\ & =30\text{ min}\end{array}$$
$$\because$$ Man takes rest for 5 minutes on each km
Total rest time = 5 × 4 = 20 min
Total travelling time :
= 30 min + 20 min
= 50 min