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?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 59
Given:
For distance = 275 km, speed = 50 km/h
For distance = 315 km, speed = 70 km/h
Concept Used:
Average speed = total Distance/Total Time
Explanation:
Time taken to cover 275 km = 275/50 = 11/2 hours
Time taken to cover 315 km = 315/70 = 9/2 hours
The average speed = (275 + 315)/(11/2 + 9/2) = 590/10 = 59 km/h
Hence, the average speed for the entire journey is 59 km/h.