A) 2hr
B) \[2\frac{1}{2}hr\]
C) 1 h r50 min
D) 2 hr 15 min
Correct Answer: B
Solution :
usual time \[\times \left( \frac{4}{5}-1 \right)=\frac{-30}{60}\] \[\Rightarrow \] usual time \[=\frac{1}{2}\times 5=2\frac{1}{2}hr\]You need to login to perform this action.
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