A ∩ B is the set that contains elements common to set A and set B.
here its {10 40 60}
26.5 goes in the first box
The answer is 689.
Find the speed of the truck:
140 miles / 3.5 hours = 40 miles per hour
The car was 20 miles an hour faster: 40 + 20 = 60 miles per hour.
Divide distance by speed: 140 miles / 60 miles per hour = 2 1/3 hours
Answer: 2 1/3 hours
