you are to drive to any interview in another town at a distance of 300 km on an Expressway interview with at 11:15 a.m. you plan to drive at hundred kilometre per hour so you drive at 8:00 a.m. to a lot some extra time you try at the speed for the first hundred kilometre but the construction work force you to slow down to 40 kilometre per hour for 40 kilometre what would be the least speed needed for the rest of the trip trip to arrive in time for the interview
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Explanation:
distance covered at 40 km/h in 40 min= 40*40/60= 80/3
remaining distance= 300-80/3
=326.667
remaining time= 3.15-.40=2.35
speed require= 326.667/2.35
=139.007 km/h
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