Question

equation: ( s = \frac{delta d}{delta t} ); solve for ( delta d ).
( a = \frac{delta s}{delta t} ); solve for ( delta s ).
solve for ( delta t ).

you travel from maine (100 miles away) to vermont (300 miles away), in 4 hours. calculate your speed.
variables: ( delta d = 300 - 100 = 200 )
formula: ( delta t = \frac{delta d}{s} )
solution: ( delta t = \frac{180}{60} = 3 ) hours / leave at 3 pm

you’re meeting a friend at 6 p.m. she lives 180 miles away. the speed limit is 60 mph. when do you need to leave?
variables: ( delta d = 180 ) miles, ( v = 60 ) mph
formula: ( t = \frac{delta d}{v} )
solution: ( t = \frac{180}{60} = 3 ) hours

Explanation:

Answer:

\(\Delta D = S\times\Delta T\)
\(\Delta S = a\times\Delta T\)
\(\Delta T=\frac{\Delta D}{S}\)
\(\Delta T = 3\) hours, leave at \(3\) p.m.
\(\Delta T=\frac{\Delta D}{S}\), \(\Delta T = 3\) hours, leave at \(3\) p.m.