Let speed of boat in still water and speed of boat in upstream be ‘9x’ km/h and ‘5x’ km/h, respectively. Speed of stream = 9x – 5x = 4x km/h Speed of boat in downstream = 9x + 4x = 13x km/h So, 13x = 390/5 = 78 Or, x = 6 Speed of boat in still water = 9 × 6 = 54 km/h Desired time = 18/54 = 20 minutes
A boat, whose speed in still water is 25% more than the speed of the current, covers 810 km downstream in _____ hours. The speed of the boat in still wa...
A man goes downstream with a boat to some destination and returns upstream to his original place in 5 hours. If the speed of the boat in still water and...
Speed of a boat in still water is 6 times more than the speed of stream. If boat covers 144 km in downstream in 9 hours, then find the time taken by the...
A boat travels downstream at a speed that is (13/12) times its speed in still water. If the boat takes 3 hours to cover 132 km going upstream, how long ...
A boat can cover 80 km upstream and 200 km downstream in 14 hours. Speed of the stream is how much less than the speed of the boat in still water if the...
A man rows to a place 42 km away and comes back to the starting point. If the speed of the stream is 2 km/hr and the speed of the boat in still water is...
A boy can swim in water with a speed of 12 km/hr in still water. If the speed of the stream is 4 km/hr, what will be the time taken by the boy to cover ...
The speed of a boat in still water is 6 km/hr more than that of the current. The time taken by the boat to cover 875 km downstream is 17.5 hours. Find t...
A boat goes 50 km in upstream in 5 hours and takes 4 hours to complete a distance of 16 km in downstream. Find the speed of boat in still water.
Two boats X and Y start towards each other from two places, 198 km apart. Speed of the boat X and Y in still water are 15 km/hr and 18 km/hr respectivel...
