Now, recall your d = rt, or distance = rate * time
so.. the train and the car, both leave LA, and go to Merced, which is 280miles away.....alrite, the train is going twice as fast as the car is, so, if the car is going "r" fast, then the train is going 2*r or 2r fast
now, the train arrives 4hrs earlier than the car, so, if the car took "t" time to arrive, the train took then t-4
now, both, arrived at Merced, that means, the distance covered by each, is 280miles
thus
solve for "r"
so.. the train and the car, both leave LA, and go to Merced, which is 280miles away.....alrite, the train is going twice as fast as the car is, so, if the car is going "r" fast, then the train is going 2*r or 2r fast
now, the train arrives 4hrs earlier than the car, so, if the car took "t" time to arrive, the train took then t-4
now, both, arrived at Merced, that means, the distance covered by each, is 280miles
thus
solve for "r"
