engineering recuitment NPCIL Plant Operator Mock Test Quantitative Aptitude Time and Work Work Efficiency
Time taken by P and Q together to do a piece of work is 9 days while time taken by Q and R together to do that work is 14.4 days. If the ratio of efficiency of P to R is 2 ∶ 1 respectively, then what is the time taken by all the three persons together to do that work?
1
(72/11) days
2
7.5 days
3
(80/9) days
4
8 days