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During exams meena studies for 30 hours, Rajesh studies for 42 hones & peruya studies for 54 hours in a day. If all the three study English for the same duration, what is the max. time spent by all the there in studying English?

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A JEE aspirant estimates that she will be successful with an 80 percent chance if she studies 10 hours per day, with a 60 percent chance if she studies 7 hours per day and with 40 percent chance if she studies 4 hours per day. She further believes that she will study 10 hours, 7 hours and 4 hours per day with probabilities 0.1, 0.2 and 0.7 respectively.

A JEE aspirant estimates that she will be successful with an 80% chance if she studies 10 hours per day, with 60% chance if she studies 7 hourse per day, and with a 40% chance if she studies 4 hours per day. She further believes that she will study 10 houers, 7 hours, and 4 hours per day with probabilities 0.1,0.2and 0.7, respectively. The chance she will be successful is

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Pipes A. B and C can fill a tank in 30 hours, 36 hours and 28 hours, respectively. All the three pipes were opened simultaneously. If A and C were closed 5 hours and 8 hours respectively, before the tank was filled completely, then in how many hours was the tank filled?