To determine the answer, multiply the number of teeth Gear 1 hasD.and the number of revolutions it makes (R). Divide that number by the number of teeth Gear 2 hasD.to determine the number of revolutions Gear 2 makes (r). Because the gears are proportional, this formula will show you the ratio of teeth to revolutions.
r= DR/d
r= 250/15, or 1610/15, or 162/3

The symbol is afuse.Fuses are designed to "blow" (melt) if the current flowing through it exceeds a specified value.

First convert the 300 minutes to hours by dividing by 60 (300 ÷ 60 = 5 hours). Use the distance formula (d=rt) and substitute the known values. 300 = 5r. r= 40.

The first bike got a 4/5 mile head start (12 × 4/60). Therefore, by the time the second bike leaves, there are
51/5 miles between them (6 4/5). Their combined rate of travel is 12 + 14 = 26 mph. Lett= the number of hours the second bike travels.
26t= 51/5
26t= 26/5
t= 26/5 ÷ 26/1
t= 26/5 × 1/26
t= 1/5
1/5 of an hour = 20 minutes. The second bike left at 2:09, so both bikes will meet at 2:29.