Your hypothesis can be that the group with calculators would finish faster than the group without calculators.
The answer is to your question is c
Answer:
It is because it is a unit of Power(which is a derived quantity)
Explanation:
The speed is determined by the distance that is traveled by an object during a given amount of time. If the time is decreased, the speed would increase. The reason for this is that time is inversely proportional to the speed of an object.
