Answer:
Option D. 20 minutes.
Explanation:
It has been given in the question that distance between the shore of a lake is 3 miles.
Speed of Jim is 4 mph and speed of John is 5 mph.
Let they meet after time t hours.
Therefore distance traveled by Jim in t hours = 4×t miles
and distance traveled by John in t hours = 5×t miles
Total distance they cover = 3 miles.
Now 4t + 5t = 3
9t = 3
t = 3/9 hours.
t = (3×60)/9 minutes.
t = 20 minutes.
Answer is they will meet after 20 minutes.