a motorboat goes and covers 40km in 5 hrs and return back 40 km in 7hrs. if water is flowimg speed 2km /hr.find the speed of motorboat in still water
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Answer:
6.7 kmph
Step-by-step explanation:
because one way speed was
40/5 kmph =8 kmph down stream
this was boat speed plus 2 kmph=(6+2)kmph
and going upstream boat speed was 40/7 kmph=
5.7kmph
= boat speed minus 2kmph
=(7.7-2)kmph
(as water flow was 2kmph)
Hence in still water
boat speed=(5.7+7.7)/2
=6.7 kmph
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