you want the sum of the distances to equal 1900 miles.
they are travelling in opposite directions and therefore the distances will add.
let the number of hours = t
d = r*t
635*t + 325*t = 1900 combine the right
960*t = 1900 divide by 960
960t/960 = 1900/960
t = 1.98 hours or 1 hour and 58.8 minutes or 1 hour 58 minutes 48 seconds.
without choices, i don't know which answer you want. perhaps even 2 hours is (rounded) close enough
17 and 19
answer: the answer is c) $0.85
if he has 3/20 of a dollar that calculates to $0.15 and $1.00 minus $0.15 equals $0.85