Question

A train travels a distance of 300 km at a constant speed. If the speed of the train is increased by 5 km an hour the journey would have taken 2 h less. The original speed of the train was

• A. 25 km/hr
• B. 28 km/hr
• C. 20 km/hr
• D. 30 km/hr

Answer 1

Answer: (A)

25 km/hr

Answer 2

Let the normal speed of train $=x$ km/hr
Let the normal time of train $=T$ hours
$\frac{300}{x}=T$ (i)

$\frac{300}{x+5}=T-2$ (ii)

Solving equations (i) and (ii), we get
$x=25,-30$ (not possible)
$\therefore$ Speed of train $=25km/hr$
The correct option is (A)