self Maths Puzzle

Choose the correct alternative..
FIND the value of [(4/7)^3-(3/7)^3]/[(4/7)^2-(3/7)^2]

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self Other Question

find a four digit number which get revers when multiply by square of second most positive integer A car covers 15 km in 12 minutes. If we decrease the speed by 5 km/hr,
then in how much time will the same car cover the same distance?