Question

Jerry is traveling 475 miles to his mothers house. If his average speed is 62 mph which is a reasonable estimate of the amount of time the trip will take

Answer 1

A)
between 5 and 6 hours
B)
between 6 and 7 hours
C)
between 7 and 8 hours
D)
between 8 and 9 hours

Answer 2

distance = rate/time

meaning time = distance/rate

try rounding 475 and 62 to two numbers that give you an integer result when divided

for example, 475 rounds up to 480 and 62 rounds down to 60.

480/6 = 8

now, whether the actual answer is above 8 or less than 8? well, we rounded 475 up a lot more than we rounded 62 down, so we naturally conclude the solution is a little less than 8