Question

solve

Answer 1

a bus travels at 100 km/hour for half an hour at 80km/hour for the next one hour
find its average speed

Answer 2

this will be a weighted avg since bus went 80 km/hr for longer time than 100 km/hr, the avg should be closer to 80
total time = 1.5 hrs
100 -> 0.5 hr ----> ratio = .5/1.5 = 1/3
80 -> 1 hr -----> ratio = 1/1.5 = 2/3

\[Avg = 100*(1/3) + 80*(2/3)\]