From the two piers, 2 steamships left towards each other. The second was on the road 7 hours less than the first.

From the two piers, 2 steamships left towards each other. The second was on the road 7 hours less than the first. But I passed 3 km / h more than the first one. The meeting took place 3 hours after the exit of the second, whose speed was 24 km / h. Find the distance between the marinas

1. We calculate with what speed the first steamer sailed.
24 – 3 = 21 km / h.
2. The steamer, sailing at a speed of 24 km / h, was en route until the meeting for 3 hours. During this time, he swam 3 x 24 = 72 kilometers.
3, The steamer moving at a speed of 21 km / h, according to the condition of the problem, was en route to
7 hours longer, that is, 3 + 7 = 10 hours. He swam 10 x 21 = 210 kilometers to the meeting point.
4. Considering that the total length of the path of both ships to the meeting point is equal to the distance between the quays, we find this distance:
210 + 72 = 282 kilometers.
Answer: between the quays 282 kilometers.