A) 4.15 km/h
B) 4.14 km/h
C) 4.25 km/h
D) 4.41 km/h
Correct Answer: B
Solution :
Speed of A = 5km/h \[\,=5\times \frac{5}{18}=\frac{25}{18}m/s\] Time taken by A to cover \[100\,\,m=\frac{100}{25}\times 18=72s\] To cover 100 ? 8 = 92 m, B takes 72 + 8 = 80 s. \[\therefore \] Speed of B \[=\frac{92}{80}\times \frac{18}{5}\] = 4.14 km/hYou need to login to perform this action.
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