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A plane left on time at noon on Monday.it arrived at its destination at 8:16 PM the same day which was 16 minutes late on average how many seconds did the plane fall behind every 15 minutes

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mananya
the right time at which the plane supposed to arrive at its destination = 8:00 pm
but arrived at =8:16 pm
time extra taken = 16 minutes
there are four 15 minutes in an hour  and 32 15 minutes in 8 hours
seconds  the plane was late = 16 x 60
                                             = 960
seconds the plane was late in every fifteen seconds = 960 /32
                                                                                    = 30
(ans) = 30 seconds