The length of each side of an equilateral triangle having an area of 4√3 cm2 is?  Choose the most appropriate option
A) 3 : 4
B) 3 : 9
C) 3 : 7
D) 3 : 1
E) 3 : 2

Rationale: let the speed of the train be x km / hr and that of the car be y km / hr . then , 120 / x + 480 / y = 8 or 1 / x + 4 / y = 1 / 15 - - - ( i ) and , 200 / x + 400 / y = 25 / 3 or 1 / x + 2 / y = 1 / 24 - - - ( ii ) solving ( i ) and ( ii ) , we get x = 60 and y = 80 ratio of speeds = 60 : 80 = 3 : 4 answer : a
Answer: A