A) 60 min
B) 55 min
C) 50 min
D) 75 min
Correct Answer: C
Solution :
[c] New speed \[=\frac{5}{6}\] of the usual speed \[\therefore \]New time taken \[=\frac{6}{5}\] of the usual time So \[\left( \frac{6}{5}-1 \right)\] of the usual time = 10 mm \[\therefore \] usual time = 50 min,You need to login to perform this action.
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