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
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Answer:
1200am is the usual time
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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
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