A steamer and a boat departed from the pier simultaneously in one direction at speeds of 21 km / h

| February 7, 2021 | education

A steamer and a boat departed from the pier simultaneously in one direction at speeds of 21 km / h and 15 km / h, respectively. Four hours later the steamer ran aground. After taking off from the shallows after a while, he caught up with the boat an hour later. How long did the steamer stand aground?

1. Let us determine how long the steamer was on the way before it caught up with the boat, if it is said that after 4 hours it ran aground and after 1 hour it caught up with the boat.

4 + 1 = 5 hours.

2. Let’s calculate the distance traveled by the steamer in 5 hours, if it is said that its speed was 21 kilometers per hour.

21 * 5 = 105 kilometers.

3. Find out how long it took the boat to cover 105 kilometers, if it is said that its speed is 15 kilometers per hour.

105/15 = 7 hours.

4. Let’s find the time that the steamer stood aground.

7 – 5 = 2 hours.

Answer: The steamer stood aground for 2 hours.



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