A) 65 km/h
B) 58 km/h
C) 55 km/h
D) 60 km/h
Correct Answer: D
Solution :
\[\because \,\,\,\,\,{{s}_{1}}=75\times \frac{20}{60}=25\,\,\text{km}\] \[{{s}_{2}}=60\times \frac{25}{60}=25\,\,\text{km}\] And \[\,{{s}_{3}}=40\times \frac{15}{60}=10\,\,\text{km}\] Average speed of train \[(s)=\frac{25+25+10}{\frac{60}{60}}=60\,\,\text{km/h}\]You need to login to perform this action.
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