Question

The diameter of a wheel of a bus is 90cm which makes 315 revolutions per minute. Determine its speed in kilometers per hour. {USE π = 22/7}

Answer 1

Given: diameter= 90cm
Speed 315 revolutions per minute
Distance travelled in 1 revolution = circumference of the wheel
= 2πr
=2×22/7×90/2
=90×22/7
= 1,980/7
Distance travelled in 315 revolutions= 1980/7×315
= 89,100cm
Speed = distance/time
= 89100cm/1min
To convert it into km/hr
Divide 89100 by 100000
And divide 1min by 60
89100/100000×1/60
89100/1×60/100000

= 53.46km/1hour

Answer 2

Answer:

Step-by-step explanation:

D = 90cm

R = 45cm

Now take perimeter of wheel

2*3.14*45/100000*315*60 ( converting into km/hr )

53.46km/hr