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Let the integers be x, x+1, x+2, ..., x+8. Average = (Sum of all integers) / 9. 23 = (9x + 36) / 9. 23 × 9 = 9x + 36. 207 - 36 = 9x. x = 19. The smallest three integers are 19, 20, 21. Sum = 19 + 20 + 21 = 60. Correct option: a
A boat goes 60 km in upstream in 5 hours and takes 3 hours to complete a distance of 12 km in downstream. Find the speed of boat in still water.
A boat can cover 145 km in downstream in 5 hours and 144 km in upstream in 8 hours. Find the speed of boat in still water.
A man can row one quarters of a kilometer against the stream in 30/4 minutes and return in 5/2 minutes. The speed of the man in still water is:
A man rows upstream 10 km and downstream 15 km taking 5 hours each. Find the speed of current.
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