Ramesh covered a total distance of 275 km on bike. For the first three hours, his speed was 65 km/h and for the rest of the journey his speed came down to 40 km/h. Find the average speed of the bike.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 55 km/h.
First 3 hours at 65 km/h , so Distance = 65 × 3 = 195 km
Remaining distance = 275 − 195 = 80 km
80 km at 40 km/h
Time for 80 km = 80 ÷ 40 = 2 hrs
Total time = 3 + 2 = 5 hrs
Average speed = 275/5 = 55 km/h