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Consider Amit lives in Delhi,connected to the internet via a $100 \hspace{0.1cm}Mbps$ connection retrieves a $250 \hspace{0.1cm} KB$ webpage from server in Bangalore, where page contain $3$ images of $500 \hspace{0.1cm} KB$ each.Assume one way propagation delay is $75 \hspace{0.1cm} ms$ and Amit's access link is the bandwidth bottleneck for this connection.If $T1$ is the time taken for the page with the  images to appear on Amit's screen using nonpersistent $HTTP$ and $T2$ is time using  persistent connection then $T=T1-T2$ will be ......msec. (Assuming queuing delay is zero)
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For non persistent we have to make the connection request after every object while in Persistent we can view all object in one go.
Here the total transmission time is nothing but the transmisson time of page with all three images. 

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