A) 48 km/h
B) 70 km/h
C) 74 km/h
D) 80 km/h
Correct Answer: A
Solution :
Average speed of the bus \[=\frac{\text{Total}\,\,\text{distance}\,\,\text{covered}\,\,\text{by}\,\,\text{the}\,\,\text{bus}}{\text{Total}\,\,\text{time}\,\,\text{taken}\,\,\text{by}\,\,\text{the}\,\,\text{bus}}\] \[=\frac{(39+25)\,\,\text{km}}{(45+35)\times \frac{1}{60}\text{h}}=\frac{64}{\frac{80}{60}}64\times \frac{60}{80}=48\,\,\text{km/h}\]
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