Question

A motor boat is speed is 15km/h. then 30km down stream and comes back. in total of 4hour 30min find the speed of the stram​

Answer 1

Answer:

Let the speed of stream be x km/h

Speed downstream= (15+x)km/h

Speed upstream= (15-x)km/h

Therefore,

30/(15+x) + 30/(15-x) =4½

30/(15+x) + 30/(15-x) =4½900/225-x²=9/2

30/(15+x) + 30/(15-x) =4½900/225-x²=9/29x²=225

30/(15+x) + 30/(15-x) =4½900/225-x²=9/29x²=225x²=25

x= 5km/hr

thus the speed of stream is 5km/hr

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Answer 2

72 = 72

96 = 96

first 69 and second 27 = 6927

58 × 87 = 58 × 85.

87 × 78

first 78 and second 85 = 7885

then. 79 × 86

•°• ANSWER = 6897

this helps you please make my answer brainliest.If 13 x 12 = 651 & 41 x 23 = 448, then, 24 x 22 =?