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A bus travel at a certain average speed for a distance of 75 km and then travel a distance of 90 km at an average speed of 10 km/h more than the first

speed if it takes 3 hours to complete the total journey find its first speed.


If it takes 3 hour to complete the whole journey and the distance is respectively 75 and 90
total speed = total distance/ total time
= 75+90/3 = 165/3
= 55 km/ hr
let first speed is x
then second speed is x+10 ( because second speed is 10km/hr more than first speed)
x= 45/2=22.5
first speed is22.5 km per hour
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