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Rate downstream = 12 + 6 = 18 km/hr Rate upstream = 12 – 6 = 6 km/hr ∴ Required time = 28/18 + 28/6 = 56/9 = `6(2)/9` hr.
The average of 9 consecutive integers is 23. What is the sum of the smallest three integers?
40% of 'P' is (2/3) of 'Q'. Determine the ratio P to Q, assuming both are co-prime.
Find the sum of all two-digit numbers that are exactly divisible by 5.
The difference between the value of the number increased by 20% and the value of the number decreased by 30% is 120. Find the number.