Answer :

To find the total time, we find the time of each segments.

Segment:ABC


Here, the frictional force is



And the centripetal force is



Therefore,




Segment:DEF


Again, the centripetal force is equal to friction.




Now, the time taken is distance/speed.


For ABC, the distance is



And for DEF we have



Therefore,



Hence the time taken is 86.3 seconds.


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