A) 16.8 \[km{{h}^{-1}}\]
B) 35 \[km{{h}^{-1}}\]
C) 64 \[km{{h}^{-1}}\]
D) 18.6 \[km{{h}^{-1}}\]
Correct Answer: A
Solution :
Here, total distance \[=8.4+2=10.4\,km\] Time \[{{t}_{1}}=30\,\min =\frac{1}{2}\,h\] and \[{{t}_{2}}=\frac{8.4}{70}h\] \[\therefore \] Total time \[=\frac{1}{2}+\frac{8.4}{70}=0.12\,h\] Now, average velocity \[=\frac{total\text{ }distance}{total\text{ }time}\] \[=\frac{10.4}{0.62}=16.8\,\,km{{h}^{-1}}\]You need to login to perform this action.
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