Esther and Amber are running 4 laps around the 400-meter track during their P. E. class. Esther runs at an average rate of 3 meters per second and Amber runs at an average rate of 2.5 meters per second, so Esther gives Amber a 100-meter head start. How many seconds will Esther need to run to catch up to Amber?

How does the map develop the central idea that scholars at jundi shapur spread the knowledge of sugar? the map illustrates the spread of sugar from new guinea to persia. the map shows that sugar was being refined primarily in the north rather than the south. the map illustrates the spread of knowledge about refined sugar processing to egypt. the map illustrates that people in china knew how to refine sugar and shared this knowledge. the answer is c