A) 30 km
B) 40 km
C) 50 km
D) 60 km
Correct Answer: B
Solution :
Average speed \[=\frac{2\times 10\times 8}{10+8}\] \[=\frac{2\times 80}{18}\] \[=\frac{80}{9}\,\,km/hr\] And time \[4\frac{1}{2}\] hours \[=\frac{9}{2}\] hours Now, total distance covered by him \[=speed\times time\] \[=\frac{80}{9}\times \frac{9}{2}\] \[=40\,\,km\]You need to login to perform this action.
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