Ben drove for 15 minutes at an acerage speed of 50 km/h at first. He then drove another 6 km at an average speed that was 44% more than his earlier speed. What was his average speed for the whole journey?
+36916 44% faster than 50 km/hr = 1.44 * 55 = 72 km/hr
Find distance @ 50 k/h 15 min = 1/4 hr 5o km/hr * 1/4 hr = 12.5 km
Find TIME @ 6 km 6 km / 72 k/hr = 1/12 hr
distance / time = average speed
(12.5 + 6 km) / ( 1/4 + 1/12) = 55.5 km/hr average
