Raj and Prem walk in opposite direction at the rate 3 km/hr and 2 km per hour respectively. How far will they be from each other after 2 hrs ?

Answer: Option B

Since Raju and Prem walk in opposite directions.
Distance covered per hour = Relative speed × Time
= (3 + 2) × 1 = 5 km   [opposite direction]
∴ Distance covered in 2 hours = 5 × 2 = 10 km