NMOS 2010 Q3

Q3. At 6 a.m. in the morning, Andrew (at Town A) and Benjamin (at Town B) were travelling in opposite directions towards each other. They met each other along the way at 12 noon. Andrew reached Town B at 4 p.m. If they travelled with different constant speeds, how long (in hours) did Benjamin take to travel from Town B to Town A?


6 h : 4 h


A -- A (6 a.m.) --------------- M (12 noon) -------------- B (4 p.m.)


B – A (?) ---------------------- M (12 noon) -------------- B (6 a.m.)


6/4 x 6 : 6 h


= 9 h


9 + 6 = 15 h