Average speed= total distance covered/total time taken
now 20.9min= .3483hr
9.82min=.1636hr
53.4min=.89hr
18.3min= .305hr
for 20.9min (.3483hr) she goes = 68* .3483= 23.6844km
for 9.82min (.1636 hr) she goes= 90.3* .1636 = 14.77308Km
for 53.4min (.89hr) she goes = 43.5 * .89 =38.715Km
Therefore total distance covered= 23.6844 + 14.77308 + 38.715 Km = 77.17248km
total time covered = .3483hr + .1636 hr + .89hr + .305hr = 1.7069hr
Average speed = 77.17248km/ 1.7069hr = 45.2120687km/hr
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