The problem given above will be solved by using the speed formula.
Speed is defined as distance over time, that is,
Speed [S] = Distance [D] / Time [T].
In the question, the value of speed that we are given is 35 and the value of D is 80, we have to find the value of time.
S = 35
D = 80
T = ?
S = D /T = 35 = 80 / T
35T = 80
T = 80 / 35 = 2.29.
Therefore, T = 2.3 hour.