A) 3 km/hr
B) 4 km/hr
C) 5 km/hr
D) 7 km/hr
Correct Answer: C
Solution :
[c] Distance coverd in 10 minutes at 20kmph=distance covered in 8 minutes at (20+x) kmph \[\Rightarrow \,\,\,20\times \frac{10}{60}=\frac{8}{60}(20+x)\] \[\Rightarrow \,\,\,200=160+8x\] \[\Rightarrow \,\,\,8x=40\] \[\Rightarrow \,\,\,x=\frac{40}{8}=5kmph\]You need to login to perform this action.
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