A bullock cart has to cover a distance of 80 km. in 10 hours.

A bullock cart has to cover a distance of 80 km. in 10 hours. If it cover half of journey in 3/5^th time, what should be its speed to cover the remaining distance in time left ?

Distance left = (1/2 x 80 ) km. = 40km.
Time left - [(1-3/5) x 10 ] hrs.
= 4 hours

Required speed = (40 / 4 ) km/hr
= 10 km/hr.