Question

A freight train left Delhi for Mumbai at an average speed of 40 km/hr. Two hours later, an express train left Delhi for Mumbai, following the freight train on a parallel track at an average speed of 60 km/hr. How far from Delhi would the express train meet the freight train?

(a) 480 km

(b) 260 km

(c) 240 km

(d) 120 km

Answer 1

Correct option is (c) 240 km

Distance travelled by freight train in 2 hour = 2 × 40 = 80 km.

Relative speed = 60 km/hr - 40 km/hr = 20 km/hr

Hence, time taken by express train to meet

Freight train = \(\frac{80 km}{20km/hr}\) = 4hr.

So, Distance travelled = 4 x 60 or 6 x 40 = 240 km.

Answer 2

The express train would meet the freight train (c) 240 km from Delhi.