Asked by Alonzo
Rosea drives her car 30 kilometers to the train station, where she boards a train to complete her trip. The total trip is 120 kilometers. The average speed of the train is 20 kilometers per hour faster than that of the car. At what speed must she drive her car if the total time for the trip is less than 2.5 hours?
Answers
Answered by
FredR
distance = velocity x time or
time = distance / velocity
total time=d1/v1+d2/v2=2.5 hrs (1)
where d1 = car distance = 30 (2)
v1 = car speed
d2 = train distance = 120 - d1 (3)
v2 = train velocity = v1+20 (4)
combine (1), (2), (3), and (4) and solve for v1
time = distance / velocity
total time=d1/v1+d2/v2=2.5 hrs (1)
where d1 = car distance = 30 (2)
v1 = car speed
d2 = train distance = 120 - d1 (3)
v2 = train velocity = v1+20 (4)
combine (1), (2), (3), and (4) and solve for v1
Answered by
Anonymous
300 and 200000
Answered by
laura
idk can you show me how please
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