Derek wants to practice playing the guitar for 9 hours in 8 days. which of the following statements match the given ratio for guitar practice?

a.
32 hours in 36 days
b.
30 hours in 28 days
c.
36 hours in 26 days
d.
27 hours in 24 days

Atourist boat is used for sightseeing in a nearby river. the boat travels 2.4 miles downstream and in the same amount of time, it travels 1.8 miles upstream. if the boat travels at an average speed of 21 miles per hour in the still water, find the current of the river.