Answer this word problem please

Question

A person drove 50 miles per hour on a trip. If he had driven 60 miles per hour, he would have arrived 4 hours earlier. What was the distance the person drove?

Answer 1

d=rt distance = rate of speed times time traveled

50t = 60(t-4) = 60t -240

10t = 240

t = 240/10 = 24 hours

50(24) = 60(20) = 1200 miles