Elias and Emma are travelling up the San Marcos River in separate canoes. Elias, averaging 3 mph, had gone 5 miles when Emma first put her canoe into the water.
a) How fast must Emma paddle her canoe to catch up to Elias by the end of the 15 mile long canoe route?
b) How long will it take Emma to reach Elias?
c) On the way up the river, the current slowed Elias’ canoe to 3 mph. But on the way back he found that he could paddle 6.5 mph. How fast was the current?
d) How fast could Elias have paddled his canoe if there were no current?