A motorcyclist drives from A to B with a uniform speed of 30 km/h and returns with a speed of 20 km/h. Find the average speed.

(a) 24 km/h

(b) 25 km/h

(c) 12 km/h

(d) 37 km/h

Solution:

Let x be the distance from A to B.

Time taken = distance travelled/speed

Total time = x/30 + x/20

= 50x/600

= x/12

Average speed = total distance/time

= 2x÷(x/12)

= 24 km/h

Hence option a is the answer.

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