20 -30
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Fill 4 ltr jar State of two jars: (4, 0)Pour from 4 ltr to 7 ltr: (0, 4)Refill 4 ltr: (4, 4)Pour from 4 ltr to 7 ltr jar until it is full: (1, 7)Empty 7 ltr: (1, 0)Pour from 4 lts to 7 ltr: (0, 1)Fill 4 ltr: (4, 1)Pour from 4 ltr to 7 ltr jar: (0, 5)Fill 4 ltr: (4, 5)Pour from 4 ltr to 7 ltr jar until it is full: (2, 7)Empty 7 ltr: (2, 0)Pour from 4 lts to 7 ltr: (0, 2)Fill 4 ltr: (4, 2)Pour from 4 ltr to 7 ltr jar: (0, 6)Done.
400 km per hour is 248.55 miles per hour.
It can go into 400 about 4.49 times.
in terms of speed, 10 mph. in terms of 400 splits, 1:30 for each 400.
Exactly 400 times