Hello I believe your answer is going to be 2 I assumed the b's were x's
Total Distance = 4km
Each person takes 4/5km
Calculate the number of times the tent has to change hands:

The answer is D. To help find the answer, you can remember an easy rule. The rule is if you're subtracting a positive number from a negative number, it will always be negative thus eliminating any answers that are positive.
Hii I believe your option would be D. I hope it helps :)
a car travels along a straight road to the east for 150 meters in 4 seconds and west for 50 meters in one second