Question

motorcyclist drives from place a to b with a uniform speed of 30 km h ki power minus 1 and returns from place b2a with a uniform speed of 20 km h ki power minus 1 find its average speed

Answer 1

Dear student,
Let distance between place A and place 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,
Tâ‚‚ = 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

Regards