.
6*r + 6*(r+9) = 126.
It is your equation to find the speed "r" of the slower steamboat.
The equation says that the total distance covered by the two steamboats is 126 miles,
and you understand why it is so.
6*r is the distance covered by the slower steamboat, while 6*(r+9) is that for the faster steamboat.
Can you solve the equation on your own ?
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See the lessons
- Travel and Distance problems
- Travel and Distance problems for two bodies moving in opposite directions
- Travel and Distance problems for two bodies moving in the same direction (catching up)
in this site.