Distance covered by Shaan in 3 hours = 3 × 50 = 150 km ∴ Remaining distance = 710 _ 150 = 560 km Relative speed = 50 + 30 = 80 kmph ∴ They meet after =
560
80
= 7 hours Now, Shaan covers the total distance in (7+3)= 10 hours ∴ Distance covered by Shaan in 10 hours = 50 × 10 = 500 km ∴ Distance between R and N = 500 km