exam Maths Puzzle Numerical Ability

wk6

Problem #4

Evaluate if possible

index 3 radical (-27)

Problem #5

Simplify

radical (7) * radical (14)

Problem #6

Simplify (45)

My answer: 3radical (5

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exam Other Question

solve the inequality

7+3t<2(t+3)-2(-1-t) The problem is:

Two cars leave town going in the same direction on the same road. One tracels at 30 mph and the other at 46 mph. In how many hours will they be 72 miles apart?

I dont get how to set up the problem.