exam Maths Puzzle Numerical Ability

can you help me determine if the following problem is rational or irrational
sqrt(48)???

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exam Other Question

If a river flows at a rate of 3mph and a boat travels 60 miles upstream and returns in a total time of 9 hours. How fast would the boat travel be traveling in still water? Two cars leave town going opposite directions. One car is traveling 55 mph, and the other is traveling 65 mph How long will it take before they are 180 miles apart?