exam Maths Puzzle Numerical Ability

A thermometer reading 79 degrees F is brought into a cold storage room with a constant temp of 38 deg F. if the thermometer reads 70 deg F in 6 mins. How long will it take to reach

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i need a step by step example of a linear programming problem! please send me one. ex)

3x-y<7
2x-y>3
y>x-3

f(x,y)=x-4y 20. Write the equation of the line which has y-intercept (0, 5) and is perpendicular to the line with equation y = -3x + 1.
A) y = -3x + 5
B) y = x + 5
C) y = 3x + 5
D) y = - x + 5