The lengths of two rectangular boxes are in the ratio 5 : 7 and their breadths are in the ratio 1 : 2 respectively. the volumes of the boxes are 15680 cu.cm and 25088 cu.cm respectively. Find the ratio of their respective heights.
1
4 : 7
2
7 : 4
3
3 : 5
4
5 : 3
5
6 : 5