Question

a bus covers a certain distance in 4 hours 20 minutes at the average speed of 60 km per hour how long will it take to cover the same distance at the speed of 40 km per hour

Answer 1

A bus covers a certain distance in 3hours 2minutes at an average speed of 45km per hrs.
Change 3 hrs 2 min to hrs. 3 + 2/60 = 3.03 hrs
Find how far the bus went in this time at 45 km/hr
d = 3.03 * 45 = 136.5 km
:
how much time will it take to cover the same distance at speed of 50 km per hours?
Time = dist/speed
t = 136.5/50
t = 2.73 hrs which is 2 + .73(60) = 2 hrs 44 min