Question

A hunter wishes to cross a river that is 1.5 km wide and flows with a speed of 5.0km/h parallel to its banks. the hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time necessary for crossing?

Answer 1

Answer:

The minimum time necessary for crossing the river is 0.125 hours

Explanation:

Given:

Width of the river=1.5km

Speed of the river stream=5.0km/hr

Speed of the boat=12km/hr

To find:

The minimum time taken for the hunter to cross the road=?

Solution:

We know  

$\text {Time}=\frac{\text {distance}}{\text {speed}}$

Distance=the width of the river is the distance

Speed= speed of the small steam boat

Substituting the values in the equation we get

$\text { Time }=\frac{\text { distance }}{\text { speed }}$

$\text { Time }=\frac{1.5}{12}$

$\text { Time }=0.125 \text { hours }$