Question

Gyan has a car whose wheels are 60 cm in diameter. How many complete revolution
does each wheel make in 15 minutes when the car is travelling at a speed of 60 km/hr.​

Answer 1

Answer:

Answer

Speed of the car =66km/hr

∴ Distance travelled by the car in 1hr or 60 minutes is 66km

⇒ Distance travelled by the car in 10 minutes is

60

66

×10=11km=11×1000×100cm

Diameter of car wheel =60cm

∴ radius of car wheel =30cm

∴ Circumference of the wheel =2πr=2×

7

22

×30=

7

1320

cm

We know that,

Circumference of the wheel = Distance travelled by the car when its wheels take one complete revolution =

7

1320

cm

∴ Number of revolutions made by wheels in 10minutes is given by

distance travelled by the car when its wheel stake one complete revolution

distance travelled by the car 10minutes

=

7

1320

11×1000×100

=

1320

77×1000×100

=5833 revolutions

∴ Number of revolutions made by wheels in 10 minutes is 5833 revolutions