A motorboat is racing towards north at 25 kmph and the water current n that region is 10 kmph in the direction of 600 east of south. The resultant speed of the boat is
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a
22 kmph
b
31 kmph
c
34 kmph
d
41 kmph
answer is A.
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Detailed Solution
vb= velocity of boat,vc= velocity of currentHere θ=(180−600)=1200⇒ R=vb2+vc2+2vbvc.cosθ=252+102+2(25)(10)cos1200=22 kmph