Question

A bus covers the first 10 km of it's journey at an average speed of 40 km/h and the remaining 45 km at an speed of 60 km/y the average speed of the bus for it's total journey is

Answer 1

Answer: 55 km/hr

Step-by-step explanation:

Required formula:

Average speed = [Total Distance] / [Total time] … (i)

Step 1:

Time taken to cover first 10 km with a speed of 40 km/hr = 10/40 = 0.25 hr

And,

Time taken to cover remaining 45 km with a speed of 60 km/hr = 45/60 = 0.75 hr

∴ Total time = 0.25 + 0.75 = 1 hr

Step 2:

Total distance covered by the bus = 10 + 45 = 55 km

Thus, based on the above formula (i), we get

The average speed of the bus for its total journey is,

= 55km / 1 hr

= 55 km/hr