Question

A man travels from A to B at a speed of 30 km/hr and B to A at a speed of 20 km/hr. The total time taken for the whole journey is 5 hours. The distance from A to B is

• A. 20 km
• B. 90 km
• C. 45 km
• D. 60 km

Answer 1

Answer:

D. 60 km

Average speed = 2xy/(x + y) Here, x = speed from A to B y = speed from B to A ⇒ Average = 2 × 30 × 20/(30 + 20) ⇒ Average = 24 km/h Time taken=5 hrs Distance=24x5/2=60km