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Speed ​​of ship and riverflow when going round up and down the river on a ship

ÀÛ¼ºÀÚ Uploader : r.soi.5 ÀÛ¼ºÀÏ Upload Date: 2018-12-12º¯°æÀÏ Update Date: 2018-12-13Á¶È¸¼ö View : 305

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¹èÀÇ ¼Ó·ÂÀ» Vs (km/hr), °­¹°ÀÇ ¼Ó·ÂÀ» Vr (km/hr)À̶ó°í ÇÏ°í »ó·ù·Î °Å½½·¯ ¿Ã¶ó°¥¶§ °É¸° ½Ã°£À» Tu (hr), ÇÏ·ù·Î ³»·Á¿Ã¶§ °É¸° ½Ã°£À» Td (hr), »óÇÏ·ù µÎ ÁöÁ¡ »çÀÌÀÇ °Å¸®°¡ L (km)À̶ó¸é, °­¹°ÀÇ ¼Ó·ÂÀº ´ÙÀ½°ú °°ÀÌ °è»êÇÒ ¼ö ÀÖ´Ù.
Assuming that Vs (km / hr) is the speed of the ship, Vr (km / hr) is the speed of the riverflow, Tu (hr) is the time taken to go to the upstream, Td is the time taken to go back to downstream, and L (km) is the distance between upstram and downstream points, the velocity of the riverflow Vr can be calculated as follows.

Time taken to move from the downstream to the upstream: Tu = L / (Vs-Vr)
Time taken to move from upstream to downstream: Td = L / (Vs + Vr)

Solving the above two expressions together,

Vs-Vr = L/Tu
Vs+Vr = L/Td

Vs = (1/2)*(L/Tu + L/Td)
Vr = (1/2)*(L/Td - L/Tu)
¡á Speed of ship


¡á Speed of riverflow


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