Carly swam 4.5 miles yesterday. her friend christine swam 1.2 times as far as carly. how far did christine swim?

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

Kelli swam upstream for some distance in a hour.she then swam downstream the same river for the same distance in only 6 minutes.if the river flows at 5km/hr, how fast can kelli swim in still water?

Given right triangle abc, what is the value of tan(a)?