Two cars are moving in the same direction with the same speed (= 30 km/h). They ale separated by a distance of b km. A truck moving in the opposite direction meets these two cars at an interval of 4 minute. The speed of truck is

See. figure. Let us apply a reversed velocity of 30 km/h onall the three velocities. The two cars will come to rest with a fixed distance of 5 km between them.∴ s = 5km and t=(1 /15)hNow x+30=5km(1/15)hor x - (75 - 30) = 45 km / h