Which expression is equivalent to 15 Q exponent two

Pick the description of a geometric object that best matches the real world object box for a deck of card

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

Ten times the square of a non-zero number is eqaul to ninety times the number