Question

A to B at a speed
A cor travelG
of 40 km/h
then returns using the
same road from B to A at a speed
of 60 km/h. What is average Speed?​

Answer 1

Answer:

50 km/h

Step-by-step explanation:

average speed= total distance/total time =100/2

50km/h

Answer 2

Answer:

48 km/h

Step-by-step explanation:

Let the distance A to B be d, speed be s and time be t.

Average speed:  s= d/t

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• Time spent one way is d/40

• Time spent on return is d/60

Average time is 2t against the distance of 2d as we are adding them up:

Total time is:

• 2t=d/40+d/60
• 2t=3d/120+2d/120
• 2t=5d/120
• 240t=5d
• d/t=240/5
• d/t=48
• s=48 km/hr average speed

Average speed was 48 km/h