Question

If a can type 5 pages in 9 minutes and b can type 6 pages in 11 minutes then the time taken to type 218 pages, if both a and b work together, is :

Answer 1

a=5,ta=5min,
b=6,tb=11,

a + b =218,
t(a+b)=????...... solve
ans. may be 55x11=605