Boats and Streams

Boats and Streams

Easy Questions
Moderate Questions
Difficult Questions
Boats and Streams Tutorial

Aptitude

Number System
Simplification
Fractions
Elementary Algebra
LCM and HCF
Average
Approximation
Unitary Method
Linear Equation
Quadratic Equation
Discount
Surds and Indices
Percentage
Square root and cube root
Order of Magnitude
Profit and Loss
Odd Man Out and Series
Work and Wages
Algebra
Stocks and Shares
True Discount
Ratio, Proportion
Partnership
Alligation or Mixture
Time and Work
Pipes and Cistern
Speed, Time and Distance
Problem on Trains
Height and Distance
Banker's Discount
Boats and Streams
Races and games
Problems on Ages
Clocks and Calendars
Simple interest
Compound Interest
Sets and Functions
Area and Perimeter
Volume and Surface Area of Solid Figures
Sequences and Series
Plane Geometry
Logarithm
Probability
Permutation and Combination
Statistics
Mensuration
Trigonometry
Aptitude miscellaneous
  1. The current of a stream runs at the rate of 4 km/hr. A boat goes 6 km and back to the starting point in 2 hours. The speed of the boat in still water is ?








  1. View Hint View Answer Discuss in Forum

    Let the speed in still water be x km/hr
    Then, 6/x + 4 + 6/x - 4 = 2

    Correct Option: C

    Let the speed in still water be x km/hr
    Then, 6/x + 4 + 6/x - 4 = 2
    ⇒ 6[ x - 4 + x + 4] = 2(x2 - 16)
    ⇒ x2 - 6x - 16 = 0
    ⇒ (x - 8) (x + 2) = 0
    ∴ x = 8 km/hr

  1. A boat moves upstream at the rate of 1 km in 10 minutes and downstream at the rate of 1 km in 6 minutes. The speed of the current is ?








  1. View Hint View Answer Discuss in Forum

    Speed upstream = 6 km/hr
    Speed downstream = 10 km/hr
    ∴ Speed of the current = (10 - 6)/2 km/hr = 2 km/hr

    Correct Option: C

    Speed upstream = 6 km/hr
    Speed downstream = 10 km/hr
    ∴ Speed of the current = (10 - 6)/2 km/hr = 2 km/hr

  1. A man rows upstream 16 km and downstream 28 km talking 5 hours each time. The velocity of the current is ?








  1. View Hint View Answer Discuss in Forum

    Speed downstream = (28/5) km/hr = 5.6 km/hr
    Speed upstream = (16/5) km/hr = 3.2 km/hr

    Correct Option: B

    Speed downstream = (28/5) km/hr = 5.6 km/hr
    Speed upstream = (16/5) km/hr = 3.2 km/hr
    Velocity of current = (5.6 - 3.2)/2 km/hr = 1.2 km/hr

  1. A man can row at 5 km/hr in still water and the velocity of current is 1 km/hr. It takes him 1 hour to row to a place and back. How far is the place ?








  1. View Hint View Answer Discuss in Forum

    Speed downstream = (5 + 1) km/hr = 6 km/hr
    Speed upstream = (5 - 1) km/hr = 4 km/hr
    Let the required distance be d km
    Then, d/6 + d/4 = 1

    Correct Option: B

    Speed downstream = (5 + 1) km/hr = 6 km/hr
    Speed upstream = (5 - 1) km/hr = 4 km/hr
    Let the required distance be d km
    Then, d/6 + d/4 = 1
    ⇒ 2d + 3d = 12
    ∴ d = 2.4 km

  1. A man can row 44 km downstream in 4 hours. If the man's rowing rate in still water is 8 km/hr, then find in what time will he cover 25 km upstream ?








  1. View Hint View Answer Discuss in Forum

    Man's rate in still water = (man's rate with current + his rate against current)/2

    Correct Option: A

    ∵ Man's rate in still water = (man's rate with current + his rate against current)/2
    ⇒ 8 = 1/2 [ 44/4 + 25/T ]
    ⇒ 16 = 11 + 25/T
    ∴ T = 5 hours