SBI PO 21 June 2015 Paper

Speed of current = x kmph
∴ Speed of boat in stillwater= 7x kmph.
∴ Rate upstream = 7x – x = 6x kmph.
∴

Distance

speed

= Time
⇒

4.2

6x

=

14

60

⇒ 14x = 42 ⇒ x =

42

14

= 3
Rate down stream
= 7x + x = 8x
8 × 3 = 24 kmph.
Time taken in covering 17.6 km =

17.6

24

hour
= (

17.6×60

24

) minutes
= 44 minutes