I have geometry work that mostly on finding missing lengths of a triangle here is a problem i am having problems with:

3-41. Solve for the missing lengths in the sets of similar figures below.
a. ΔABC ∼ ΔOPQ

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Awasher and a dryer cost $701 combined. the washer costs $51 more than the dryer. what is the cost of the dryer?

Aremote-controlled boat can travel at 4 feet per second in calm water. the boat traveled 48 feet with the current, and then it traveled 16 feet against the current in the same amount of time. how fast is the current?