John wants to go abroad by ship and return by air. He has a choice of 6 different ships to go and 4 airlines. To return. In how many ways can be perform his journey ?

Answer

To solve the problem of how many ways John can perform his journey by choosing a ship to go abroad and an airline to return, we can break it down step by step.

### Step-by-Step Solution:

1. **Identify the Choices for Going and Returning**:
- John has **6 different ships** to choose from for his journey abroad.
- He has **4 different airlines** to choose from for his return journey.

2. **Calculate the Total Combinations**:
- For each ship that John chooses, he has 4 options for airlines. This means that for each ship, there are 4 different ways to return.
- Therefore, if John chooses one ship (let's say S1), he can return by any of the 4 airlines (A1, A2, A3, A4). This gives us 4 combinations for that one ship.

3. **Extend the Calculation to All Ships**:
- Since there are 6 ships, and for each ship, there are 4 returning options, we can multiply the number of ships by the number of airlines:
\[ \text{Total Ways} = (\text{Number of Ships}) \times (\text{Number of Airlines}) = 6 \times 4 \]

4. **Perform the Multiplication**:
- Now, we perform the multiplication:
\[ 6 \times 4 = 24 \]

5. **Conclusion**:
- Therefore, the total number of ways John can perform his journey is **24**.

### Final Answer:
John can perform his journey in **24 different ways**.

---