book Maths Puzzle Numerical Ability

A cake is removed from a oven at 325F and cools to 150F after 25 minutes in a 68f room. How long will it take to cool to 115F?

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book Other Question

an isosceles triangle has an area of 200 square units, and the altitude to the base measures 10 units. what is the perimeter of the triangle? A bus traveled for 2h @ r mi/h, then decreased the speed by 10 mi/h and traveled for 1 more hour. How far did the bus go?