Answer :
d = r * t is the formula that will be used to find the distance traveled.
Serenity: d = 17 * 2
Serenity = 34 miles
Mystic: d = 20 * 2
Mystic = 40 miles
34 + 40 = 74 miles
They are 74 miles apart after 2 hours
Serenity: d = 17 * 2
Serenity = 34 miles
Mystic: d = 20 * 2
Mystic = 40 miles
34 + 40 = 74 miles
They are 74 miles apart after 2 hours