A boat moves down stream at the rate of 1 km in 6 minutes and
upstream at the rate of 1 km in 10 minutes. The speed of current is
Pick:
A) 2 kmph  B) 3 kmph  C) 4 kmph  D) 5 kmph  E) 6 kmph
If speed(in kmph) of the boat=b and current=c, then   In downstream time taken(in hrs.)=1/(b+c)=6/60=1/10 or b+c=10 ---(i) &amp;   In upstream time taken(in hrs.)=1/(b-c)=10/60=1/6 or b-c=6 ---(ii)   From (i) &amp; (ii), b=8, c=2   2 kmphNSWER:2 kmph
<result>A</result>
A boat moves down stream at the rate of 1 km in 6 minutes and
upstream at the rate of 1 km in 10 minutes. The speed of current is