Answer:
I ask for a tutor to get a question.
Let the speed of Mary with no current be x km/h
speed of current= 3 km/h
Time=distance/speed
distance swum against current=2km
Time taken to swim against current=2/(x-3)
distance swum with current=8km
Time taken to swim with current=8/(x+3)
Given that the time taken in both instances are the same, then:
2/(x-3)=8/(x+3)
solving for x we get:
2(x+3)=8(x-3)
2x+6=8x-24
6+24=8x-2x
30=6x
x=30/6=5 km per hour
Therefore we conclude that:
Mary's speed with no current is 5 km/h
Answer:0.0083
Step-by-step explanation:
![x=13.8](https://tex.z-dn.net/?f=x%3D13.8)
<u><em>Step-by-step explanation:</em></u>
- Since the triangle is right use the tangent ratio to solve for x
![tan41^o=\frac{opposite}{adjacent}=\frac{12}{x}](https://tex.z-dn.net/?f=tan41%5Eo%3D%5Cfrac%7Bopposite%7D%7Badjacent%7D%3D%5Cfrac%7B12%7D%7Bx%7D)
- Multiply both sides by
x ×
( divide both sides by
)
x = ≈ ( nearest tenth )