A man covered a distance of 180 km in 4 hours on a bike. How much distance will be cover on a bicycle in 8 hours if he rides the bicycle at one-sixth the speed of the bike ?

Answer: Option B

Speed of the bike :
$$\begin{array}{rl}& =\left(\frac{180}{4}\right)\text{km/hr}\\ & =\text{45 km/hr}\end{array}$$
Speed of the bicycle :
$$\begin{array}{rl}& =\left(\frac{1}{6}\times 45\right)\text{km/hr}\\ & =7.\text{5 km/hr}\end{array}$$
∴ Required distance :
= (7.5 × 8) km
= 60 km