Question

a motorcyclist drives from place a to b with a uniform speed.of 30km h and return from place b to a with a uniform speed of 20 km h. Find the his average speed ?​

Answer 1

Let distance between A and B is D

Then, time taken by motorcyclist with uniform speed 30 km/h ,T₁ = distance/speed = D/30 hrs

Again, they return with uniform speed 20 km , so time taken by motorcyclist , T₂ = D/20 hrs

Now, average speed of motorcyclist = total distance/total time taken

= (D + D )/(D/30 + D/20) km/h

= 2 × 30 × 20/(30 + 20) km/h

= 24 km/h

Answer 2

(30+20)/2

=50/2

=25km/h

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