self Maths Puzzle Numerical Ability Time and Work

P, Q and R can do a work in 6 hours, 7 hours, and 14 hours respectively. they together start the work 10 am P leaves after 2 hrs and Q leaves 20 minutes before completed the work and what time work will be completed?

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self Other Question

is it ok to attend five to six questions correctly in each sections. if is attend so how many percentile will i get.... A question paper had ten questions. Each questions could only be answered as True(T) or False(F). Each candidate all the answered all the questions. yet, no two candidates wrote the answers in an identical sequence. How many different sequence of answers are possible?