2.5 what just use the formula pi•(4/3r•r)
Answer:
Time taken by the un powered raft to cover this distance is T = 192.12 hr
Step-by-step explanation:
Let speed of boat = u ![\frac{km}{hr}](https://tex.z-dn.net/?f=%5Cfrac%7Bkm%7D%7Bhr%7D)
Speed of current = v ![\frac{km}{hr}](https://tex.z-dn.net/?f=%5Cfrac%7Bkm%7D%7Bhr%7D)
Let distance between A & B = 100 km
Time taken in downstream = 32 hours
![32 = \frac{100}{u +v}](https://tex.z-dn.net/?f=32%20%3D%20%5Cfrac%7B100%7D%7Bu%20%2Bv%7D)
![u + v = \frac{100}{32}](https://tex.z-dn.net/?f=u%20%2B%20v%20%3D%20%5Cfrac%7B100%7D%7B32%7D)
u + v = 3.125 ------ (1)
Time taken in upstream = 48 hours
![48 = \frac{100}{u -v}](https://tex.z-dn.net/?f=48%20%3D%20%5Cfrac%7B100%7D%7Bu%20-v%7D)
![u -v = \frac{100}{48}](https://tex.z-dn.net/?f=u%20-v%20%3D%20%5Cfrac%7B100%7D%7B48%7D)
u - v = 2.084 ------- (2)
By solving equation (1) & (2)
u = 2.6045 ![\frac{km}{hr}](https://tex.z-dn.net/?f=%5Cfrac%7Bkm%7D%7Bhr%7D)
v = 0.5205 ![\frac{km}{hr}](https://tex.z-dn.net/?f=%5Cfrac%7Bkm%7D%7Bhr%7D)
Now the time taken by the un powered raft to cover this distance
![T = \frac{100}{v}](https://tex.z-dn.net/?f=T%20%3D%20%5Cfrac%7B100%7D%7Bv%7D)
Because un powered raft travel with the speed of the current.
![T = \frac{100}{0.5205}](https://tex.z-dn.net/?f=T%20%3D%20%5Cfrac%7B100%7D%7B0.5205%7D)
T = 192.12 hr
Therefore the time taken by the un powered raft to cover this distance is
T = 192.12 hr
Answer:
50 degrees =0.873 radian
Formula 50 degrees x π/180= 0.8727 radians
Answer:
it is b
Step-by-step explanation: