The diameter of each wheel of car is 70 cm. If each wheel rotates 400 times per minutes, then the speed of the car (in km/hr) if : $$\left( {{\text{Take }}\pi = \frac{{22}}{7}} \right)$$
A. 5.28 km/hr
B. 528 km/hr
C. 52.8 km/hr
D. 0.528 km/hr
Answer: Option C
Solution (By Examveda Team)
Circumference of wheel = 2πr⇒ 2πr
⇒ 2 × $$\frac{22}{7}$$ × $$\frac{70}{2}$$
⇒ 220 cm
Speed per hours :
= $$\frac{{220 \times 400 \times 60}}{{1000 \times 100}}$$
= 52.8 km/hr
This Question Belongs to Arithmetic Ability >> Speed Time And Distance
Join The Discussion