Test:2 QNo:4

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A ship travelling at 10m/s. A dolphin at 5 m/s along a line parallel to that of the ship and at a distance of 30m from it. The visibility is 50 m.Find the maximum time for which the dolphin will be visible from the ship. The ship is 70m long

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7 Answers

1

ultimatemaster ·2009-09-23 11:31:19

please solve this

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1

Jagaran Chowdhury ·2009-09-23 11:54:53

velocity of ship wrt dolphin=(10-5)=5m/s

distance for which it will be visible=50-30+length of ship
=50-30+70
=90m
time taken to cover 90m@5m/s=90/5=18s

dolphin will be visible for 18 seconds

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$ourav @@@ -- WILL Never give ·2009-09-23 13:14:29

i know d answer is 60 seconds....but i dont know d exact solution ..;plz help

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62

Lokesh Verma ·2009-09-24 01:50:04

The dolphin will be visible for a relative distance of 40+40+70 meters..

40 comes from the visibility factor...

70 is the length of the ship (orange)

use pythagoras to get 40 on both sides....

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kartik sondhi ·2009-09-25 06:35:02

But Even I got 10.39 Sec Because 90√10²-5²

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62

Lokesh Verma ·2009-09-26 23:35:30

The black line has a length of 70+80=150

relative speed is 5

so the time will be 150/5 = 30 seconds

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Vijay Yevatkar ·2011-10-27 03:42:01

But i m nt understandin dis sum....pls can ny1 xplain??

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