A) 4.5 hr.
B) 5.5 hr.
C) 6 hr.
D) 5 hr.
Correct Answer: C
Solution :
Let the usual speed be\[x\,\,km/hr\]and time taken by usual speed by\[y\]hour \[\because \] \[x\times y=\frac{3}{4}x(y+2)\] \[\Rightarrow \] \[4xy=3xy+6x\] \[\Rightarrow \] \[xy=6x\] \[\therefore \] \[y=6\,\,hours\]You need to login to perform this action.
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