David knew he made a mistake when he calculated that gilda walks 123 miles to the station. read through david's calculations: using d = rt, the distance is the same, but the rate and time are different. if gilda misses the train, it means the time t needs 7 more minutes at a rate of 3 mph, so d = 3(t + 7). if she gets to the station 5 minutes early it means the time t can be 5 minutes less at a rate of 4 mph so d = 4(t - 5). 3(t + 7) = 4(t - 5) 3t + 21 = 4t - 20 t = 41 d = rt, so d = 3(41) = 123 find david's mistake in his calculations. in two or more complete sentences, explain his mistake. include the correct calculations and solutions in your answer.