# TCS Placement: Sample Questions 161 - 163 of 502

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## Question 161

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### Write in Short

Radha and Usha together can complete the work. If Radha alone will do then she will take 8 hours more than time taken by them and if Usha alone will do the same work then she will take 4.5 hours more time than time by them. In how much time Usha alone can complete the work?

### Explanation

Let Radha and Usha together take x hours to complete the work.

Radha alone takes hours to complete the same work.

Usha alone takes hours to complete the same work.

Usha alone will take hours to complete the work.

## Question 162

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### Write in Short

One sequence is given, 58,27, 12, x, 2. Find x.

### Explanation

• Here, first term is 58.

• Applying this pattern we are getting correct terms of the series.
• So, series is 58, 27,12, 5,2
• Value of x will be 5.

## Question 163

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Essay▾

What is WDM?

### Explanation

• WDM (Wavelength-division Multiplexing) combines a number of wavelengths onto the same fiber simultaneously.
• WDM is similar to FDM but multiplexing and demultiplexing involve light signals through fiber optics channel.
• A powerful aspect of WDM is that each optical channel can carry any transmission format.
• WDW dramatically increases the capacity of a fiber network and hence forms the Layer 1 transport technology in all tiers of the network.

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