Question

A hunter wishes to cross a river that is 1.2 km wide and that flows with a speed of 4.7 km/h. The hunter uses a small powerboat that moves at a maximum speed of 12.7 km/h with respect to the water. What is the minimum time necessary for crossing?

Answer 1

0.095 hours = 5.7 mins

Step-by-step explanation:

from the questions we are given the following:

distance (s) = 4.7 km/h

maximum speed of boat with respect to the water (S) = 12.7 km/h

speed of flowing water = 4.7 km/h

minimum crossing time =?

the minimum crossing time can be gotten from the formula

time =
`(distance)/(max speed of the boat)`

in this question we would not be considering the speed of the flowing water because we were told to find the minimum time to cross with a boat moving at a maximum speed with respect to the flowing water

time =
`(1.2)/(12.7)`

= 0.095 hours = 5.7 mins