Question

8. The sum of the digits of a two digit number is

9. The number obtained by interchanging its digits is 9 less than thrice the original number. Find the number. The speed of the boat in still water is 30 km/h. A boat travels for three hours downstream and then returns the same distance upstream in five hours. Find the speed of the stream.

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Answer 1

Answer:

90km per hour is the answer

Answer 2

Answer:

speed is 7.5 km/hrs