the diameter of the Wheels Of The Bus is 140 cm how many Revolution per minute must be really make in order to move at a speed of 66 km per hour options a)200 b)250 c)300 d)350
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Circumference of the wheel
= πd
= 22/7 × 140 cm
= 22×20cm
= 440 cm
so wheel cover 440 cm in one revelution
if it at speed of 66km/h then distance covered in one hour = (66 x 1000 x100) / 60 = 110000 cm
so ,
1 : ? :: 440cm : 110000cm
1×110000/440 = ?
250 = ?
so
a) 250 is right
= πd
= 22/7 × 140 cm
= 22×20cm
= 440 cm
so wheel cover 440 cm in one revelution
if it at speed of 66km/h then distance covered in one hour = (66 x 1000 x100) / 60 = 110000 cm
so ,
1 : ? :: 440cm : 110000cm
1×110000/440 = ?
250 = ?
so
a) 250 is right
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