Problema Solution

Larry's time to travel 371 miles is 3 hours more than Terrell's time to travel 220 miles. Terrell drove 2 miles per hour faster than Larry. How fast did each one travel?

Answer provided by our tutors

let


v1 = the speed of Larry

d1 = 371 miles the distance Larry traveled

t1 = the time of Larry's travel


v2 = the speed of Terrell

d2 = 220 miles the distance Terrell traveled

t2 = the time of Terrel's travel


Larry's time to travel 371 miles is 3 hours more than Terrell's time to travel 220 miles


t1 = 3 + t2


Terrell drove 2 miles per hour faster than Larry


v2 = 2 + v1


we also know that speed = distance/time => time = distance/speed


t1 = d1/v1 = 371/v1


t2 = d2/v2 = 220/v2


plugin this values in t1 = 3 + t2 we get


371/v1 = 3 + 220/v2 multiply both sides by v1v2


371v2 = 3v1v2 + 220v1


and replace v2 = 2 + v1 in the above equations


371(2 + v1) = 3v1(2 + v1) + 220v1


solving the quadratic equation


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we find and consider only the positive roots since v1 > 0


v1 = 53 mph


v2 = 2 + v1 = 2 + 53 = 55


v2 = 55 mph


Larry traveled with 53 mph while Terrell traveled with 55 mph.