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Let the distance be ‘D’ km According to the question, Downstream speed x + y = d/20 or d = 20 (x+y) .......... (i) Upstream speed x-y = d/30 or d = 30(x-y) ........... (ii) Comparing (i) & (ii) 20(x+y) = 30(x-y) 2(x+y) = 3(x-y) 2x + 2y = 3x - 3y x = 5y Hence, y = Speed of the current = 12 km/hour. Speed of boat, x = 5 × 12 = 60 km/hr
“Wannacry” and “Petya” are related to which?
If the maximum marks for both Test 1 and Test 2 are 80, and the maximum marks for Test 3 are 100, then how much percentage has A scored more than C cons...
Two trains of same length are running in parallel tracks in the same direction with speed 70 km/hr and 120 km/hr respectively. The latter completely cro...
The balanced reaction for following chemical reaction is:
Barium sulphate + Aluminium chloride → Barium chloride + Aluminium sulphate
The world’s first inter-continental large wild carnivore translocation project is associated with Kuno National Park, Wild Cheetahs were brought from ...
Which of the following is produced when hydrochloric acid reacts with water?
A train covers a distance of 72 km at the speed of 48 km/h the next 69 km distance covers with a speed of 46 km/h and last 54 km with the speed of 72 km...
Which of the following statements is/are correct in regards to Champaran Satyagraha?
1. It was the first popular satyagraha movement
In the middle of the year 2023, which entity or organization has released the Green Deposit Framework?
Who among the following is the author of “The life of Mahatma Gandhi”?
