Question

Say true or false.

The wheels of a car are of diameter $80$ cm each. It will make $4300$ complete revolutions in $10$ minutes.Then the car is travelling at a speed of $66$ km per hour.

• A. True
• B. False

Answer 1

The correct option is B False

Circumference of wheel = $\frac{22}{7}\times 80$ cm
Total distance to be travelled = $4300\times$ circumference.
Time = $10$ minutes.
Thus speed = Distance $÷$ time = $[4300\times \frac{22}{7}\times 80÷{10}^{5}km)]÷\frac{10}{60}hour$ = $64.86\frac{km}{hr}$