Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

A truck covers a distance of 150 km at a certain average speed and then covers another 200 km at an average speed which is 20 km per hour more than the

first speed. if the truck covers the total distance in 5 hours, find the first speed of the truck.

Time =5 hours let us take x as average speed to cover 150 km then x+20 will be the average speed to cover next 200 km then 150/x+200/x+20=5 5 x square+100 x=350 x+3000 x square-50 x-600=0 by solving the equation we get the x=60 km therefore average speed to cover 150 km=60 km/h

Let the first speed be x distance covered with this speed 150 another speed is x+20 dist covered is 200 t1=150/x t2=200/x+20 t1+t2=5 150/x+200/x+20=5 hence we get following quadratic eq x²-50x-600=0 on solving it we get x=60 thus its speed in first case is 60km/h