Question

a bus covers a certain distance in 3 hours 20 minutes at the average speed of 45 km per hour how long will it take to cover the same distance at speed of 36 km per hour​

Answer 1

Time taken by the bus in the 1st case

=3hrs.20mins.

=10/3hrs.

Average speed of the bus = 45km/hr

we know that, average speed = d/t

so, 45km/hr= d/10/3

or, d= 45×10/3

or, d= 150 km

In the second case, distance is same

so,

d= 150km/hr

s= 36km/hr

therefore time taken= d/s

so, time taken = 150/36 hrs

or, t = 4_1/6 hrs

or, t = 4 hrs + 1/6×60

or, t = 4 hrs and 10 minutes