Question 1024324
 A man walks 30 minutes at an average speed of 3km /hr.
 He waits 10 minutes for a bus, which brings him back to starting point at 3.15pm.
 If he began his walk at 2.25 pm the same afternoon, find the average speed.
:
Find the total time of the trip: 3:15 - 2:25 = 50 min; {{{5/6}}} hrs
Find the distance to the bus stop: .5hrs * 3km/h = 1.5 km
Round trip = 3km and we know it took 5/6 hr
let a = the average speed of the trip
{{{3/a}}} = {{{5/6}}}
cross multiply
5a = 3 * 6
a = {{{18/5}}}
a = 3.6 km/hr average speed for the whole trip