Asked by Israel

Two 4 meter lorry cars are moving along the same direction on a straight road with a constant speeds of 70 km/hr and 90km/hr. if a passenge falls asleep when the faster car is 20m behind the slower car but wakes up after it is 20m ahead of the slower car. find how long he slept?
Answered by Chanz
Multiply each speed by .2777 to get them in m/s. You'll car 1 is gaining 5.6 meters each second. For the 40m you're talking about a 7 second nap.
Answered by soroh
I need the calculation
Answered by tommy
time = 8.6secs
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