Question

out of a total distance covered of 200km first half is covered at the speed of 60km/hr and remain covered at 75km/hr find the total time taken to cover whole journey,find the avrage speed of whole journey

Answer 1

First half of the journey is covered at the speed of 60km/hr.
i.e., 6okm is covered in 1hr0
∴, 100km is covered in (1/60×100)=100/60×60=100mins.
Remaining 100km is covered at the speed of 75km/hr.
i.e., 75km is covered in 1hr
∴, 100km is covered in (1/75×100)=100/75×60=80 mins.
∴, Total time=100+80=180 mins=3hrs.
Average speed =200/3=66.667 km/hr

Answer 2

answer of total time is 3 hr.

answer of average speed is 200/3