Problema Solution
A cruise ship made a trip of 220 mi in 15 h. The ship traveled the first 60 mi at a
constant rate before increasing its speed by 4 mph. Then it traveled another 160 mi at
the increased speed. Find the rate of the cruise ship for the first 60 mi
Answer provided by our tutors
Let
d = 220 mi
t = 15 h
x = rate of speed for first 60 mi
(x+4) = rate of speed for remaining 160 mi
Since travel time=distance/speed we have:
60/x + 160/(x + 4) = t
60/x + 160/(x + 4) = 15
........
click here to see the equation solved for x
........
x = 12 mph
The rate of the cruise ship for the first 60 miles was 12 mph.