Correct Answer - Option 3 : 65 Km/hr
Given:
First distance = 150 km
First speed = 75 km/h
Remaining distance = 130
Overall average speed in entire journey = 70 km
Concept used:
Average speed = (Total distance)/(Total time)
Calculations:
Time taken in first 150 km = 150/75 = 2 hr
Total distance = 150 + 130 = 280 km
So, total time = Distance/Speed
⇒ 280/70 = 4 hrs
Time for rest of the journey = 4 – 2 = 2 hrs
Average speed for the remaining journey = 130/2 = 65 km/hr
∴ The car’s average speed for the remaining journey is 65 km/h