Question 107
A bus covers a distance of first 50 km in 40 minutes, next 50 km at a speed of 2 km per minute and the next 30 km at a speed of 1.0 km per minute. What is its average speed during the entire journey ?
Solution
Average speed = $$\ \frac{\ Total\ Distance}{Total\ time}$$
Total distance = 50+50+30 = 130km
Total time = $$\ \frac{\ 40}{60}$$+$$\ \ \ \frac{\ 50km}{120kmph}$$+$$\ \ \ \frac{\ 30km}{60kmph}$$ = $$\ \frac{\ 19}{12}hr$$
Avg speed = $$\ \frac{\ 130}{\frac{19}{12}}=82.1\ kmph$$
So, option E is the answer.
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