Given: The distance between two points A and B is 200 km The distance between points B and C is 180 km. Ram coves the distance AB at a speed of 50 km/hr and that of BC by 60 km/hr. Formula Used: Average speed = Total distance travelled/Total time taken. Time = distance/speed Calculation: According to the question Total distance travelled = 200 + 180 ⇒ 380 km Total time taken =
200
50
+
180
60
=7hr. ⇒ Average speed =
380
7
⇒ Average speed = 54.26 ⇒ 55 km/hr ∴ The average speed from A to C is 55 km/hr.