Question
A man rows a boat 24 kms in 3 hours downstream and
returns upstream in 6 hours. The speed of the stream (in km per hour) is:Solution
Rate downstream = 24/3 = 8 km/hr Rate upstream = 24/6 = 4 km/hr Now, speed of the stream = (rate downstream – rate upstream)/2 ⇒ (8 – 4)/2 = 2 km/hr
The least number which when divided by 6, 7, 10, 13, and 15 leaves the same remainder 5 in each case, is:
What is the Highest Common Factor of 54, 162 and 270?
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