1 hr 40 mins = 5/3 hours
average speed = 117 / 5/3 = 117*3 / 5 = 70.2 kph.
2. speed = distance / time
70.2 = 19.2 / time
time = 19.2 / 70.2 = 0.2735 hours = 16.5 minutes answer
$396,800. This is because 78 years divided by 13 years is 6. So the money would double 6 times... giving you $396,800.
2/18 or 1/9 IS THE ANSWER :D