Asked by Lin
A bus leaves Town A on Saturday night and is supposed to arrive at Town B at 08:17 am on Sunday morning. If the estimated journey time is 10 hours 43 minute, at what time on Saturday should the bus leave Town A?
Answers
Answered by
Reiny
let's consider midnight as time zero
10:43 - 8:17 = 2:26
So it must have left 2 hours and 26 minutes before midnight, or
the bus left town A at 9:34 pm
or:
we could use international time format
let's add 24 hours to 8:17 to get 32:17
and 32:17 - 10:43 = 21:34
which is 9:34 pm, using the "am pm" notation.
Most scientific calculators will have a button labeled D°M'S
This can be used in the calculation of angles in degrees, minutes and seconds of angle.
Since time has the same ratio of hours: minutes: seconds it can also be used for calculations of time (addition and subtraction only, it makes no sense to multiply two times)
to do 32:17 - 10:43 , enter
32
D°M'S
17
-
10
D°M'S
43
=
to get 21°34'00.00 , which is 21:34 or 9:34 pm
10:43 - 8:17 = 2:26
So it must have left 2 hours and 26 minutes before midnight, or
the bus left town A at 9:34 pm
or:
we could use international time format
let's add 24 hours to 8:17 to get 32:17
and 32:17 - 10:43 = 21:34
which is 9:34 pm, using the "am pm" notation.
Most scientific calculators will have a button labeled D°M'S
This can be used in the calculation of angles in degrees, minutes and seconds of angle.
Since time has the same ratio of hours: minutes: seconds it can also be used for calculations of time (addition and subtraction only, it makes no sense to multiply two times)
to do 32:17 - 10:43 , enter
32
D°M'S
17
-
10
D°M'S
43
=
to get 21°34'00.00 , which is 21:34 or 9:34 pm
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