the radius of A wheel of a circle is 70 cm and it takes 5 minutes to make 300 rotations find the speed of the cycle in kilometres per hour(take 22 /7)
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Radius ÷ 70 cm
Distance covered in one rotation = circumference of wheel = 2πr
= 2×22/7 ×70
=44×10
=440 cm
Distance covered in 300 rotation = 300 × 440 cm = 132000 cm
= 132000// 100000 km
=1.32 km
Now thus distance of 1.32 km is covered in 5 minutes or 5/60 hour
Speed of cycle = distance/ time
= 1.32 ÷ 5/60 km per hour
=1.32 × 60/5. km per hour
=79.2/51
=15.84 km per hour
Step-by-step explanation:
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Answer ➴➴
Radius of the wheel = 70 cm
Circumference =
2\pi \: r = (2 \times \frac{22}{7} \times 70) = 440 \: cm2πr=(2× 7
22 ×70)=440cm
Distance covered by the wheel in 1 revolution = 440 cm
Distance covered in 500 revolution = (440×300) cm = 132000= 1.32
Distance covered in 1 hour
= \frac{1.32}{5} \times 60 = 15.84= 5
1.32×60=15.84
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