engineering recuitment UPCL AE (E&M) 2021 Mock Test Quantitative Aptitude Time and Work Pipe and Cistern
A tap can fill a tank in 10 hours. After half the tank is filled, four more similar taps are opened, What is the total time taken to fill the tank completely?
1
6 hrs 45 min
2
6 hrs
3
7 hrs
4
8 hrs