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time taken for first part of journey = 10/60 = 1/6 hr
for 2nd part = 10/40 =1/4 hr
total distance travelled = 20 km
total time = 1/6+1/4= 5/12 hr
average speed = total distance/ total time = 20/5/12 = 48km/hr
for 2nd part = 10/40 =1/4 hr
total distance travelled = 20 km
total time = 1/6+1/4= 5/12 hr
average speed = total distance/ total time = 20/5/12 = 48km/hr
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