Question

A train when moves at an average speed of 50 km/hr, reaches its destination on time. When its average speed becomes 40 km/hr, then it reaches its destination 24 minutes late. The length of the journey is:

• A. 50km
• B. 70km
• C. 80km
• D. 60km

Answer 1

Answer:

C. 80km

S1 = 50 km/hr S2 = 40 km/hr t = 24 minutes = 24/60 hr Distance - (S1 x S2)/(S1 - S2) x t (50 x 40) / (50 - 40) x 24/60 = (50 x 40)/10 x 24/60 = 80km