Teaching BPSC बिहार माध्यमिक TGT (9 to 10) शिक्षक भर्ती 4.0 Mock Test Quantitative Aptitude Time and Work Work Efficiency
A can write 750 pages in 25 hrs. A and B together can write 1350 pages in 27 hrs. In what time can B write 420 pages ?
1
15 hours
2
18 hours
3
21 hours
4
More than one of the above
5
None of the above