Book Maths Puzzle Time Distance and Speed

Sandi's Subaru travels 280 mi averaging a certain speed. If the car had gone 5 mph faster, the trip would have taken one hour less. Find Sandi's average speed.

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Book Other Question

During the first part of a canoe trip,Tim covered 60km at a certain speed. He then traveled 24km at a speed that was 4 km/h slower. If the total time for the trip was 8 hr.,what w the current in a typical Mississippi River shipping route flows at a rate of 4 mph. In order for a barge to travel 24 mi upriver and then return in a total of 5 hr, approximately h