Starting from point P, Hari and Ravi begin walking at speeds of 3 km/h and 3 1/2 km/h respectively. If they walk in opposite directions, after how much time will the distance between them be 5.2 km?

Correct option is C

 
Given:
- Speed of Hari = 3 km/h
- Speed of Ravi = 3.5 km/h
- Required distance = 5.2 km
Formula Used:
1. Relative speed when two people move in opposite directions: Relative speed = Speed of Hari + Speed of Ravi
2. Time = Distance / Relative speed
Solution:
1. Calculate relative speed: Relative speed = 3 + 3.5 = 6.5 km/h
2. Calculate time taken to cover 5.2 km: Time = (5.2 / 6.5) × 60 = 48 minutes Answer: (c) 48 minutes