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54% of 250 = 6 × 21 + √? => 135 = 126 + √? => √? = 135 – 126 => √? = 9 => ? = 81
A boy can swim in water with a speed of 15 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 ...
A boat moving downstream covers a distance of 200km in 5 hrs as long as to cover the same distance upstream it takes 10hrs. What will be the time taken ...
A boat moving upstream takes 8 hours 48 minutes to cover a distance while it takes 4 hours to return to the starting point, downstream. What is the rati...
The speed of a boat in still water is 30 km/hr. If the boat covers 240 km in upstream in 12 hours, then find the time taken by the boat to travel 140 km...
The ratio of the speed of boat in upstream to speed of boat in downstream is 7:9. If the boat can cover a total of 70 km upstream and 144 km downstream ...
The speed of the stream is 15 km/h. Boat ‘A’ covers 100 km distance against the stream in 4 hours and boat ‘B’ covers 90 km distance against the...
The speed of a boat in still water is 25 km/hr. If the boat covers 160 km in upstream in 10 hours, then find the time taken by the boat to travel 204 km...
The ratio of the speed of the boat in upstream to that of in downstream is 3:4, respectively. If the speed of the current is 5 km/h, then find the speed...
The speed of current is 10 km/hr. If the speed of the boat in still water had been 8 km/hr more than the original speed, then it would take 7 hours to c...
A boat covers a distance of 240 km downstream in 8 hours. If the ratio of upstream speed to downstream speed of the boat is 2:5, then find the distance ...
