RRB Paramedical Staff Nurse Model Paper 1

Question : 56 of 100

Marks: +1, -0

The difference between simple interest and compound interest of a certain sum of money at 20% per annum for 2 years is Rs. 48. Then the sum is:

Solution:

U = upstream speed

⇒( {b}- {w})

D = downstream speed

⇒( {b}+ {w})

b = speed of boat in still water
w = speed of stream

∴u+d=82

b-w+b+w=82

b=41

kmph
ATQ,

41-w=105/3=35

w=6

kmph

b+w=126/t

t=126/47

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