Calculate packet delay

Question

A network has B bandwidth and a sender is sending data of length L. If there are N intermediate routers from sender to destination, approximate delay will be

A.2 NL/B

B. NL/B

C.L/B

D N

Answer 1

Since nothing is mentioned about the Propagation delay, we'll take that as 0. 

Transmission delay of the packet = (Length of the Packet) / (Bandwidth) = L / B.

Since there are N intermediate routers, 

total transmission delay = (N + 1) * Transmission delay of the packet  {1 transmission at the source, and N at the routers}.

So, total transmission delay = (N + 1) * L / B.

The closest answer looks like: B. NL/B