Question

Q. A bus traveling along a straight highway covers one-third of the total distance between two places with a velocity 20 km/ h. The remaining part of the distance was covered with a velocity of 30 km/ h for the first half of the remaining time and with velocity
50 km/ h for the next half of the time. Find the average velocity of the bus for its whole journey.​

Answer 1

Answer:

29.03 kmph

Explanation:

let distance be x

x/3 at 20 kmph

remaining 2x/3

1/2 of remaining is 1/2 of 2x/3 = x/3 at 30 kmph

and remaining ( x - x/3 - x/3 = x/3) at 50 kmph

first part takes (x/3)/20  hours

2nd part takes (x/3)/30 hours

3rd part takes (x/3)/50 hours

totally  time taken for a distance of x km = (x/3) ( 1/20 + 1/30 + 1/50) hours

totally time taken for a distance of x km = (x/30)( 15 + 10 + 6)/30 = (x/30)(31/30) = 31x/900

average speed = total distance/total time = x/ ( 31x/900) = 900/31 kmph = 29.03 kmph

Answer 2

Answer:

hey mate!this is the answer for your question 29 km/h