Speed is given by the formula: speed=distance/ time this implies that when we rewrite the above formula for distance we shall have: distance=speed*time from our question: speed=60 mph time=3 1/2 hours=3.5 hours thus distance=60x3.5 =210 miles the answer is 210 miles
Answer: Doubling the red marbles means that each 2 red marbles will be replaced by 4 red marbles. So after doubling the red marbles for each 3 blue marbles there will now be 4 red marbles, giving a new ratio of 3:4.
