Question

A car travels first $100km$ in $2\frac{1}{2}$ hours and next $30km$ in $\frac{1}{2}$ hour. What is its average speed ?

• A. $\frac{130}{2}km/h$
• B. $\frac{130}{3}km/h$
• C. $\frac{100}{3}km/h$
• D. None of these

Answer 1

The correct option is B $\frac{130}{3}km/h$

Total distance $=100+30=130$ km

Total time = $2\frac{1}{2}+\frac{1}{2}$

= $\frac{5}{2}+\frac{1}{2}$ = $\frac{6}{2}$ = 3 hrs

Average speed = 130 $÷$ 3 = $\frac{130}{3}$ km/h