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T1, T2, T3, T are 'n' taps. Efficiency of T_{2} is 2 times of T_{1} for T_{3} it is 3 times of T_{1} and similarly, efficiency of T_{n} is n times of T_{1} T_{1} opened first. At intervals of one minute, Taps T_{2} T_{32} T_{4} Tare opened respectively in that order. Find the time taken to fill a tank in this way which can otherwise be filled by tap T_{1} alone in 90 minutes.
T1, T2, T3, T are 'n' taps. Efficiency of T_{2} is 2 times of T_{1} for T_{3} it is 3 times of T_{1} and similarly, efficiency of T_{n} is n times of T_{1} T_{1} opened first. At intervals of one minute, Taps T_{2} T_{32} T_{4} Tare opened respectively in that order. Find the time taken to fill a tank in this way which can otherwise be filled by tap T_{1} alone in 90 minutes.
7 mins 12 seconds
O 7 mins 24 seconds
O 7 mins 10 seconds
7 mins 40 seconds
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