A) 70 km/hr
B) \[70\frac{5}{123}km/hr\]
C) \[65\frac{5}{123}km/hr\]
D) 72 km/hr
Correct Answer: C
Solution :
[c] \[\text{Average}\,\,\text{speed=}\frac{\text{Total}\,\,\text{distance}}{\text{Total}\,\,\text{time}}\] \[=\frac{600+800+500+100}{\frac{600}{80}+\frac{800}{40}+\frac{500}{400}+\frac{100}{50}}=65\frac{5}{123}\,km/h\]You need to login to perform this action.
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