Question

a vehicle drives from A to B with uniform
speed of 30km/h and return back at the
speed of 20km/h. Find its average speed.​

Answer 1

Answer:

Let distance between A and B is D

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

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

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

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

= 2 × 30 × 20/(30 + 20) km/h

= 24 km/h