Question

Harry moves from A to B at a speed of 40 km per hour and a same distance from B to C at a speed of 60 km per hour and he returns along the same path from C to A at a speed of 70 km per hour . Find the average speed of the entire journey

Answer 1

Answer:

um of two speeds=60 km/h+40km/hr = 100km/hr

Average speed = 100/2 = 50km per hr

Answer 2

40km/hour = 40 km travel distance

However while he is actually only covering the same distance while he is travelling at 60km /hour

So on his return trip he completes the 40km in just 40mins

So the distance is 80km round trip and it was completed 60min + 40mins = total of 100 minutes

So 80km ÷100 minutes = 0.8km per minute x 60 minutes / hour = Therefore the average speed is 48km per hour.