IBPS RRB Office Assistant 23 Sep 2017 Paper

(1) Rate downstream of boat= 22 kmph
∴ Time taken in covering 190km. =

198

22

= 9 hours
∴Time taken by boat in covering 190km upstream
= (9 + 2) hours = 11 hours
∴ Rate upstream of boat
=

198

11

= 18 kmph.
∴ Speed of boat in still water
=

1

2

(22 + 18) kmph.
= 20 kmph.