The answer is the last one
Answer:
540
Step-by-step explanation:
9 times 60 equals 540
To solve for the time it takes to travel a certain distance at a certain speed, use the formula,
time = distance / speed
Given that the entire journey takes four hours, add up the time it takes David to row upstream with that of him travelling downstream. This is mathematically represented as,
total time = time upstream + time downstream
4 = 3/(x - 1) + 3/(x +1)
Solving for x in the equation gives 2. Thus, David's speed in still water is 2 miles per hour.
The answer is 200 because if you round it to the nearest 10 it’s 200
Well if those are negatives then i would think one answer would be -$21.50