Two ferries travel across a lake 50 miles wide. one ferry goes 5 miles per hour slower than the other. if the slower ferry leaves 1 hour earlier than the faster, but both arrive at the same time, what is the speed of the slower ferry

Step-by-step explanation:

Let x be the speed of first ferry.

Then the speed of second slower ferry is x-5 (since 5 miles per hour slower)

Time taken by first ferry = distance/speed =

Time taken by second ferry =

Since second ferry starts one hour early, difference in times is 1 hour.

Speed cannot be negative.

Hence answer is speed of the first ferry = 18.5 mph

and second ferry i.e. slower ferry is = 13.5 mph

more detail

step-by-step explanation:

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.