?
A car runs first 275 km at an average speed of 50 km/h and the next 315 km at an average speed of 70 km/h. What is the average speed (in km/h) for the entire journey?
Answer & Solution
Correct Answer:
Option
C
Time taken to cover 275 km = $$\frac{{275}}{{50}}$$ h = 5.5 h
Time taken to cover 315 km = $$\frac{{315}}{{70}}$$ h = 4.5 h
Average speed of entire journey
$$\eqalign{ & = \frac{{{\text{Total distance}}}}{{{\text{Total time taken}}}} \cr & = \frac{{590}}{{10}} \cr & = 59{\text{ Answer}} \cr} $$
Time taken to cover 315 km = $$\frac{{315}}{{70}}$$ h = 4.5 h
Average speed of entire journey
$$\eqalign{ & = \frac{{{\text{Total distance}}}}{{{\text{Total time taken}}}} \cr & = \frac{{590}}{{10}} \cr & = 59{\text{ Answer}} \cr} $$
Join the Discussion
Login to post a comment or share your explanation.
Login