book Maths Puzzle Numerical Ability

Solve for t and find the digit that equals a: [3(230+t)]^2=492,a04

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i need help on my homework so here it is- 2(x+y+2) An airplane leaves Chicago for Cleveland at a speed of 475 mph. Twenty minutse later, a plane going to Chicago leaves Cleveland, which is 350 miles from Chicago, at a speed of 500