Question

A man who regularly drive between two cities find that if he drives at an average speed of 120km he arrives 2 hours before his usual time and if he drives at an average speed of 60km he arrive 3 hours later than his usual time what is the usual time

Answer 1

Answer:

1200am is the usual time

Answer 2

Answer:

Step-by-step explanation:

let's distance between 2 cities= x

usual time B/W cities= t

we know that;

speed= distance/time

when speed is 120km per hour

120=x/t-2

120(t-2)=x

x=120t-240    -------- 1

when speed is 60km per hour

60=x/t+3

x=60(t+3)

x=60t + 180   --------- 2

by 1 & 2

120t-240=60t+180

120t-60t=240+180

60t=420

t=420/60

t=7

hence time is 7hour