Question

The circumference of a wheel is 9 m 75 dm and it turns 4 times per second. Find
the time taken by the wheel to cover 390 Km.​

Answer 1

Answer:

390 km=390000m

circumference=9.75m

It turns 4 times in 1 second

so,4*9.75m= 39m

hence it covers 39m in one second.

speed=39m/s

time=distance/speed

=390000/39=10,000 seconds

=1hr=3600seconds

hence 10,000/3600=100/36=25/9= 2.77hrs

hence it will take 2.7 hrs to cover 390 km

pls mark as  brainliest answer.