Problema Solution
A train needs 4 hours to go from the first station to the second. If the third station is 120 miles away and the total travel time must be no more than 7 hours, write an inequality that would let you find the slowest average speed, v, the train could have.
Answer provided by our tutors
Since average speed = distance/time follows time = distance/average speed.
120/v <= 7 - 4
120/v <= 3
v >= 40
The slowest average speed would be 40 mph.