Question

the diameter of a wheel of a bus is 90 cm which makes 315 revolutions per minute. Determine its speed inkilometers per hour. take pie as 22/7

Answer 1

The diameter of a wheel of a bus is 90cm ,so radius=45cm

=>circumference=2πr
. =2*22/7*45
. =2*22/7*45/100000
(converting it in kilometres)
Now,revolution per minute are 315...
=>2*22/7*45/100000*315
=2*22/7*45/100000*315*60
(per minute)

=>37422000/700000
=>53.46 km/h!!!



Hope this helps u!