The wheels of a car are of diameter of 80 cm each. How many complete revolution does each wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour?
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Radius = 80 ÷ 2
= 40 cm
[ 1 km = 1000cm]
[ 1 m = 100 cm ]
Speed = 66 km / hour
= 66 × 1000 × 100 ÷ 60
= 110000 cm / minute
Time = 10 minutes
• Travelling of 1 complete revolution by wheel ;
= speed × time
= 110000 × 10
= 11,00,000 cm
Circumference of wheel = 2pie R
= 2 × 22 ÷ 7 × 40
= 1760 ÷ 7 cm
( 1760 ÷ 7 ) cm distance travelled = 1 revolution
1 cm distance travelled = 1 ÷ 1760 revolution
11, 00, 000 cm distance travelled ;
= 7 ÷ 1760 × 11,00,000
= 625 × 7
= 4375 ( Ans.)
# Hope this helps :-)
= 40 cm
[ 1 km = 1000cm]
[ 1 m = 100 cm ]
Speed = 66 km / hour
= 66 × 1000 × 100 ÷ 60
= 110000 cm / minute
Time = 10 minutes
• Travelling of 1 complete revolution by wheel ;
= speed × time
= 110000 × 10
= 11,00,000 cm
Circumference of wheel = 2pie R
= 2 × 22 ÷ 7 × 40
= 1760 ÷ 7 cm
( 1760 ÷ 7 ) cm distance travelled = 1 revolution
1 cm distance travelled = 1 ÷ 1760 revolution
11, 00, 000 cm distance travelled ;
= 7 ÷ 1760 × 11,00,000
= 625 × 7
= 4375 ( Ans.)
# Hope this helps :-)
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