Answer:
the answer is 
Step-by-step explanation:
You have to find the common denominator in order to get the sum.
multiply 5 to
and you get 
then to double check the sum, subtract it.

hope this make sense :/
Answer:
B
Step-by-step explanation:
Answer:
Step-by-step explanation:
4 workers × 5 hours = 20 worker-hours
Each vehicle requires 1 worker-hour
For five workers it will take four hours