5. A sonar apparatus in a ship sends out a signal vertically downwards. The signal returns after 1.6 s. Find the depth of the sea. The velocity of sound in water = 1500 m/s . answer is 1.2km
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20% is left after spending.
20%is 2520
60% is 3x2520=7560
total salary is 7560+2x2520
=7560+5040
=12600
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