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Let the speed of boat in still water =B and speed of stream =S then Distance =D ATQ- 
Both directions distance is equal = 9(B+S) =18(B-S) 9B+9S=18B-18S 27S=9B S: B=1:3 =>B=3S So now- Take time Three-fifths of the same distance in still water=(D/B)×3/5 =9(B+S) ×3/5 /B =[9(3S+S) ×3/5]/3S =36/5=7.2hours.
A man travelled a total distance of 350 km. He travelled first 200 km on car with a speed of 20 km/h and rest of the distance on bike whose speed is 5 k...
The distance between two points 'P' and 'Q' is 2,400 km. Karan and Mohit can cover the distance between 'P' and 'Q' in 40 hours and 32 hours, respective...
A train 180 meters long passes a man walking in the same direction at 6 km/h in 15 seconds. What is the speed of the train?
‘K’ and ‘L’ are going from place ‘X’ to place ‘Y’, which is 1100 km apart. If ‘K’ started 3 hours after ‘L’ but both of them rea...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 27 km/hr and 15 km/hr, respectively. If the distance covered by ‘Aâ...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 25 km/hr and 20 km/hr, respectively. If the distance covered by ‘Aâ...
X started to run from point ‘A’ to ‘B’ at a speed of 28 km/hr at 9:00 am and Y started to run from point ‘B’ to ‘A’ at a speed of 12 km/...
Travelling at a speed of 54 km/h, Chaman reaches a place 3 minutes early. If he had travelled at a speed of 48 km/h, he would have been 1 minute late. W...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 25 km/hr and 15 km/hr, respectively. If the distance covered by ‘Aâ...
Emily walks to the library at 4 km/h and returns at 2 km/h. The total time spent traveling is 9 hours. What is the distance from her home to the library?
