There are fewer pears than apples: 8-6=2kg.

The pear my mother bought is 2 kilograms lighter than the apple.

2. Distance traveled when A meets: 120×3/5=72 (km).

Because car A and car B met at this time and drove 120km.

So when we met, the distance from Shop B was 120-72=48 (km).

A: When we met, the distance from Shop B was 48 kilometers.

Men's wear completed in March and June: 6240( 1+ 1/5)= 5200 (sets)

A: In June, 5,200 sets of men's wear were produced.

4. The original price of this color TV: 2400 ÷ (1-20%) = 3000 yuan.

The original price of this color TV set is 3000 yuan.

5. The salt content of this cup of brine is:10 ÷ (10+90) =10%.

Answer: The salt content of this glass of water is 10%.