Question

A bus travels with 90 kmph for first 20min and 54 kmph for next 20min.
Find the average speed of the bus

Answer 1

Explanation:

A speed of a bus is 60 km/h. How much distance will it travel in 2h and 20 min?

The formula which relates distance, speed, and time is:

d = rt, where d is the distance traveled, r is the rate of travel or speed, and t is the time traveled.

Since we're given that r = 60 km./hr. and time t = 2 hrs. 20 min., then we can find time d traveled by the bus by substituting the given information into the distance-speed-time formula as follows:

d = rt

d = (60 km./hr.)(2 hrs. 20 min.)

= (60 km./hr.)(2⅓ hrs.)

NOTE: 20 minute = ⅓ of an hour.

= (60)(7/3) km.

NOTE: 2⅓ = 7/3

= (60/3)(7) km.

= (20)(7) km.

d = 140 km. is the distance a bus traveling at 60 km./hr. can travel in 2 hrs. and 20 min.

Answer 2

QUESTION:-

A bus travels with 90 kmph for first 20min and 54 kmph for next 20min.

Find the average speed of the bus

EXPLANATION:-

We know that:-

20 min=20/60=1/3 hour

CASE-1

Distance=1/3×90

Distance=30 km

CASE-2

Distance=1/3×54

Distance=18 km

Now,

Average speed=(30+18)/(1/3+1/3)

Average speed=(48)/(2/3)

Average speed=(48×3)/3

Average speed=77 kmpm