Math- DRIVING A truck driver drove 120 miles in 1 & hours. What is the speed of the truck in miles per hour?

Question

DRIVING A truck driver drove 120 miles in 1 & hours. What is the speed of the truck in miles per hour?

Answer 1

if a driver drove 120 miles in 1 + x hours

then the speed in miles per hour

is found using the formula d=rt, distance = rate of speed times time traveled

120 = r(1+x)

r = 120/(1+x) = speed

for example if x= 1/2 hour, then

r = 120/(1.5) = 80 mph

if x = 1/4 hour, then

r = 120/1.25 = 96 mph

if x = 3/4 hour, then

r = 120/1.75 = about 68.6 mph

if x = 1 hour, then

r = 120/2 = 60 mph