A) 6 kmph
B) 15 kmph
C) 8 kmph
D) 8-5 kmph
Correct Answer: B
Solution :
Total time \[=\frac{5}{10}+\frac{10}{20}\] \[=\frac{1}{2}+\frac{1}{2}=1\,\,hour\] \[=\frac{10+5}{1}\] \[=15\,\,kmph\]
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