book Maths Puzzle Numerical Ability

sqrt25x^4 over sqrt81y^2

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what are the 15 steps on how to study algebra more effectively the sinhagad express left pune at noon sharp two hours latter deccan queen started from pune in the same direction. the deccan queen overtook the sinhagad express at 8 pm. find the avg speed of two train over the journey if the sum of avg speed is 70kmph