A boat travels 60 km upstream and 100 km downstream in 8 hours and then travels 75 km upstream and 175 km downstream in 12 hours. What is the speed of the boat in still water?(a) 36 km/hr (b) 30 km/hr (c) 24 km/hr (d) 20 km/hr(e) 16 km/hr

1) a
2) b
3) c
4) d
5) e

• 60/(x+y) + 100/(x-y) = 8
  similarly 75/(x+y) + 175/(x-y) = 12
  where x-> speed of boat, y-> speed of stream
  solving both we get
  x=20 and y=5
  so, required ans = 20km/hr i.e. (d) option
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