The interval is [25, 160].
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sixty 25 to 40 multiply both by 4 then becomes 100 to 160 and 160 - 100 = 60
25 + 30 + 40 + 45 + 60 =200 200/5 = 40
There are 60 minutes in 1 hour so there are 2 hours and 40 minutes in 160 minutes.
It is a 60% increase
The LCM of 60 and 160 is 480.