A) 1 hour
B) 30 minutes
C) 45 minutes
D) 40 minutes
Correct Answer: A
Solution :
Usual time = x minutes New time \[=\left( \frac{4x}{3} \right)\]minutes \[\left( \because \,\,Speed\propto \frac{1}{Time} \right)\] According to the question, \[\frac{4x}{3}-x=20\] \[\Rightarrow \] \[\frac{x}{3}=20\] \[\Rightarrow \] x = 60 minutes i.e. 1 hour.You need to login to perform this action.
You will be redirected in
3 sec