Question

A fast train covers $360km$ in $3$ hours $20$ minutes. How much time will it take to cover a distance of $90km$.

Answer 1

Distance covered by a fast train is $360km$

Time taken to cover is $3hr20min=3+\frac{20}{60}hr=\frac{10}{3}hr$

Speed of the train is $\frac{distance}{time}=\frac{360}{\frac{10}{3}}=108km/hr$

Time taken to cover $90km$ is $\frac{90}{108}=\frac{10}{12}hr=\frac{10}{12}\times 60min=50min$