Question

If a car travelled 15 km in 0.5 hours and 30 km in the next 1.5 hours, what is the average of speeds?

• A. 30 km/hr
• B. 25 km/hr
• C. 20 km/hr
• D. 40 km/hr

Answer 1

The correct option is B 25 km/hr

Speed 1 =$\frac{Distance1}{Time1}$

= $\frac{15}{0.5}$

= 30 km/hr

Speed 2 = $\frac{Distance2}{Time2}$

= $\frac{30}{1.5}$

= 20 km/hr

Average of Speeds = $\frac{Speed1+Speed2}{2}$

=$\frac{30+20}{2}$
=$\frac{50}{2}$ = 25 km/hr