A car travels 40 km at speed of 8 km/hr.
Find the speed at which it should
travel next 160k
so that the average
speed of the trip is 10 km/hr.
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distance travelled at 8km/hr = 40km
total distance to be travelled = 160km
at 10 km/hr = (160+40) / total time
total time = 20 hours
time wasted travelling 40 km at 8km/hr = 40/8 = 5 hour
time remaining = 20-5 = 15 hours
distance remaining speed = 160 km
speed required to average the speed to 10km/hr = 160/15 = 10.66666667 km/hr
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