A) \[65\frac{6}{123}\text{km/h}\]
B) 60 km/h
C) \[60\frac{5}{123}\text{km/h}\]
D) 62 km/h
Correct Answer: A
Solution :
Total time \[=\frac{600}{80}+\frac{800}{40}+\frac{500}{400}+\frac{100}{50}=\frac{246}{8}\,\,\text{h}\] Average speed \[=\frac{600+800+500+100}{\frac{246}{8}}\] \[=\frac{2000\times 8}{248}=65\frac{6}{123}\,\,\text{km/h}\]You need to login to perform this action.
You will be redirected in
3 sec