Question

A train is moving at a constant speed.
If the train covers $50km$ in $2$ hours, how much time would it take to cover $100km$?

• A. $2h$
• B. $8h$
• C. $6h$
• D. $4h$

Answer 1

The correct option is D $4h$

Given:
Distance travelled in $2h=50km$.
Speed = $\frac{\text{Distance}}{\text{Time}}$ .
$\Rightarrow$$\text{Speed}=\frac{50}{2}$ = 25 $km{h}^{-1}$
Now, to travel $100km$ at the same speed as given above,
Speed $=25km{h}^{-1}$ $=\frac{\text{Distance}}{\text{Time}}$
$\Rightarrow$Time $=\frac{100km}{25km{h}^{-1}}$
$\Rightarrow$ Time $=\frac{100}{25}=4h$.