RRB Paramedical Staff Nurse Model Paper 2

Distance travelled by boat in upstream =24km
Time taken =6h
Thus, speed of boat in upstream =‌

24

6

=4kmhr
And distance travelled by boat in downstream =20km
Time taken =4h
Thus speed of the boat in downstream =‌

20

4

kmhr
=5km/h
Now, the speed of the boat in still water=‌

1

2

[Speed of the boat in upstream + speed of the boat in downstream]
=‌

1

2

[4+5]
=‌

1

2

×9=4.5km/h
And speed of the current
=‌

1

2

[ Speed of the boat in downstream - speed of the boat in upstream]
=‌

1

2

[5−4] =‌

1

2

×1=0.5km/g