Answer:
14hrs
Step-by-step explanation:
v = speed in still water
t = downstream trip time
d = distance = 182 miles; same distance both downstream and upstream
t + 12 = upstream return trip time
u = current flow = 3 mph
Downstream: d = (v + u)t; Upstream: d = (v - u)(t + 12)
(v - 3)(t + 12) = 182 (equation 1)
(v + 3)t = 182 (equation 2)
Subtract equation 2 from equation 1 to get t:
(vt + 12v -3t -36) - (vt + 3t) = 0
12v - 6t - 36 = 0
t = 2v - 6
Substitute this result for t into equation 2 and solve for v:
(v + 3)(2v - 6) = 182
2v^2 - 6v + 6v - 18 = 182
v^2 = 100
v = 10 mph
t = 2v - 6 = [2(10) - 6] hrs = 14 hrs
Answer:
hi and mine are they/them
Step-by-step explanation:
7/12. This is because you have to add fractions. Basically you do 4+3 to find 7 and place it over 12.
Answer:
4 degrees Celsius
Step-by-step explanation:
It is asking for the change in temperature, or the difference. In word problems like this it is asking for subtraction.
So you just need to subtract the temperature at noon from the temperature at 8 am.
18 - 14 = 4 degrees
