Explanation:

- Total target: The team needs to chase 282 runs.

- Runs scored in first 20 overs: Their run rate was 4.5, so they scored 4.5 x 20 = 90 runs.

- Remaining runs needed: 282 - 90 = 192 runs.

- Overs left to play: 30 overs.

- Asking rate for remaining overs: 192 runs ÷ 30 overs = 6.4 runs per over.

Options:

1. 6.8: This is higher than necessary.

2. 6.3: This is lower than required.

3. 6.4: This matches the calculated required rate.

4. 6.0: This is too low to reach the target.