I think the answer is A (sorry if it isn't).
It expands due to heat and makes it easier to open the jar.<span />
Answer:
jwuwhisbuebeu said that good morning and private s the
Answer:
4 km/hr
Explanation:
The computation of the actual velocity is shown below:
Because the path of its paddles is opposed to the current direction, the real velocity can be determined by deducting the current velocity to its velocity while paddling
So, the actual velocity is
= Upstream - downstream
= 19 km/hr - 15 km/hr
= 4 km/hr
As we can see it is in positive, so it is an upstream direction
