Question
X started to run from point βAβ to βBβ at a
speed of 21 km/hr at 9:00 am and Y started to run from point βBβ to βAβ at a speed of 18 km/hr at 11:00 am. If they meet each other at 3:00 pm then find the distance between points βAβ and βBβ.Solution
Distance covered by X in 2 hours = 21 Γ 2 = 42 km Relative speed of X and Y = 21 + 18 = 39 km/hr Sum of distance covered by both in 4 hours = 39 Γ 4 = 156 km Total distance between points βAβ and βBβ = 42 + 156 = 198 km