exam Maths Puzzle Numerical Ability

Can someone help me on this?

I need to find the reciptrocal of (-1/5)(15)

Thanks,
Ashley

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exam Other Question

An oil tanker and a cruise ship leave port at the same time and travel straight-line courses at 10 mi/h and 25 mi/h, respectively. Two hours later they are 40 mi apart. What is the angle between their courses? Solve using the quadratic formula:
x2 - 3x = 7x - 2

x2 - 7x - 1 = -7

both of these need to in solve these 2 I have not been able to get this done.