Maths most loved question for SSC_CGL, Bank, Railway

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Q 
 A boat went down the river for a distance of 20 km. it then turned back and returned to its starting point, having traveled a total of 7 hours. on its return trip, at a distance of 12 km from the starting point, it encountered a log, which had passed the starting point at the moment at which the boat had started downstream. the downstream speed of the boat is?

Answer:


Step-by-step explanation:

Let x be the speed of the water in still water and y be the speed of the stream.

Also, the time taken by the boat in travelling {d + (d - 12)} Km , the boat after lag travels 12 km



Also, it traveled a total of 7 hours on the return



We need to find the value of (x + y)

Now, solving equations (1) and (2) , We get

x + y = 10

Therefore, Speed of the boat in the downstream is 10 km/hour

Q. 
What percent of 0.72 quintal is 2250 grams

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