Host A wants to send a file of size $1Mb($mega$-$bits$)$ to Host $B.$ They are connected via $2$ routers $(3($serial$)$ communication links between Hosts A and B$).$ The capacities of $3$ communication links are $10Mbps,20Mbps,$ and $1Mbps.$ How long does it take for the file to be transmitted from Host $A$ to Host $B?$ Consider no propagation delay, processing delay, and queueing delay.