exam Maths Puzzle Numerical Ability

Sean is buying a new DVD player and speakers for $315. The store offers him an interest free payment plan that allows him to pay in monthly installmants of $25.

Use n to stand f

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i would really appriciate help with this problem sqrt(243)/sqrt(3)

so far i have 9sqrt3 times sqrt(3)/sqrt(3) times sqrt(3)

what i dont get is how to multiply the top part

thank you It takes Terry 2 hours longer to do a certain job than it takes Tom. They worked together for 3 hours. Then Tom left and Terry finished the job in one hour. How long would it take each of them to do the job alone?