Two airport shuttle trains leave the main station at the same time. Shuttle A returns to the station every 8 minutes. Shuttle B
returns to the station every 10 minutes. In how many minutes will shuttles A and B leave the station together for the second time? A. 10 minutes
B. 18 minutes
C. 40 minutes
D. 80 minutes
EG and FH are diagonals of the rhombus and the bisect each other at the centre to for a righ angle triangle with the side of the rhombus as the hypothenus. By pythagoras theorem,