# TCS Placement: Sample Questions 265 - 267 of 502

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## Question 265

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### Describe in Detail

Essay▾

Write a function to swap the values of two integers.

### Explanation

Program:

1. `#include<stdio.h>`
2. `int main()`
3. `{`
4. `    int x=15, y=20;`
5. `    x=x+y;`
6. `    y=x-y;`
7. `    x=x-y;`
8. `    printf(“After swapping :x=%d, y=%d”, x, y);`
9. `    return 0;`
10. `}`
• Output:

After swapping: x = 20, y = 15

## Question 266

### Question

MCQ▾

A is 20 percent more efficient than B. If two persons can complete a piece of work in 60 days then in how many days A working alone can complete the work?

Choice (4)

a.

90

b.

100

c.

80

d.

110

d.

### Explanation

• A is 20 % more efficient than B.
• If B՚s per day work is 100 units then A՚s per day work will be 120.
• Both persons together complete a day.
• If they work together, they will take 60 days to complete the work. So total work = 60 x 220
• We are asked to find the number of days to complete the work when A alone is working, which will be
• So, A alone will take 110 days to complete the work.

## Question 267

### Question

MCQ▾

If a man can swim downstream at 6kmph and upstream at 2kmph, his speed in still water is:

Choice (4)

a.

4kmph

b.

2kmph

c.

2.5kmph

d.

3kmph

a.

### Explanation

• Let the speed of man in still water is u kmph.
• Downstream speed means person is swimming in the direction of water and upstream speed means person is swimming in the opposite direction of flowing water.
• Downstream speed, a = 6 kmph and upstream speed, b = 2 kmph
• Speed of man, u = (a + b) /2

u = (6 + 2) /2

u = 4 kmph

• Man՚s speed will be 4 kmph in still water.

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