Correct Option: C
As per the given in above question ,
Downstream speed = 30/2 = 15 kmph
Upstream speed = 30/6 = 5 kmph
Let speed of the boat be p,
then speed of the current = p /2.
From either of the two equations, we can find the value of p, p = 10 kmph
Another set of formula which can serve as
shortcut in above case is
| Speed of the boat = | Downstream Speed + Upstream Speed |
| 2 |
| Speed of the stream = | Downstream Speed - Upstream Speed |
| 2 |
Putting these in the above example,
| Speed of the boat = | 15 + 5 | = 10 kmph |
| 2 |
| & Speed of the stream = | 15 - 5 | = 5 kmph |
| 2 |
