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"has done" should be changed to "have done." After "who," the verb should agree with the subject "I," so "have" is the correct form. The improved sentence is “Do you know that it is I who have done this piece of beautiful work?”
A boat covers some distance downstream in 1 hour. It covers 3/2 hours. If the velocity of the stream is 3 kilometers per hour, then what will be the vel...
The sum of the speeds of two boats A and B in still water is 56 km/hr. such that the speed of boat A in still water is 25% less than that of boat B in s...
The speed of the stream is 11 km/h. Boat ‘A’ covers 84 km distance against the stream in 6 hours and boat ‘B’ covers 90 km distance against the ...
A boat, whose speed in still water is 25% more than the speed of the current, covers 315 km downstream in _____ hours. The speed of the boat in still w...
A boy can swim in water with a speed of 13 km/hr in still water. If the speed of the stream is 5 km/hr, what will be the time taken by the boy to cover ...
The speed ratio of a stream to the upstream speed of a boat is 1:9. A boat takes 2 hours and 30 minutes to travel 82.5 km downstream. Determine the time...
A boat is traveling downstream along a river at a speed of 60 km/h. After covering half the total distance, the speed of the river's current increases b...
The Speed of a boat in still water is 14 km/hr and the speed of the current is 4km/hr. It takes a total of 8.5 hours to row upstream from Point A to B ...
The ratio of the speed of a boat in still water to its speed in downstream is 6:8. If the difference between the time taken by the boat to travel 288 km...
The speed of the boat upstream and downstream are in the ratio of 3:4. If the boat covers a distance of 147 km in still water in 7 hours, determine the...
