Question
The combined speeds of boats 'P' and 'Q' in still water
amount to 52 km/hr. The current's speed affecting boat 'P' is 25% greater than that affecting boat 'Q'. Boat 'Q' can cover 1927 km downstream in 41 hours, while boat 'P' takes 47 hours to cover the same distance downstream. Determine the upstream speed of boat 'P'.Solution
ATQ, Speed of boat ‘P in still water be ‘p’ km/hr Therefore, speed of boat ‘Q’ in still water = (52 – p) km/hr Let the speed of the current for boat ‘Q’ be q km/hr Therefore, speed of current for boat ‘P’ = 1.25q km/hr According to the question, (p + 1.25q) = 1927/47 = 41 ….. (1) Also, (52 – p + q) = 1927/41 = 47 …. (2) On solving equation (1) and (2), we get Speed of boat ‘P’ in still water = p = 21 km/hr Speed of the current for boat ‘Q’ = q = 16 km/hr Therefore, speed of the current for boat ‘P’ = 1.25q = 20 km/hr Therefore upstream speed of boat ‘P’ = p – 1.25q = 21 – 20 = 1 km/hr
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The artist wanted to bring...
In the following question a sentence or a phrase is given which can be substituted by one word. Choose the most appropriate word explaining the sentence...
Find the correct meaning of highlighted word/phrase.
She gave up the job after getting married.
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1) The manager, 2)...
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...Fill in the Blank with appropriate Phrasal verb:
Could you ________ the music while I'm on the phone?
Choose the correct word that can replace the given phrase.
a state of being completely forgotten or ignored
Find the appropriate Phrasal verb.
They decided to ________ his number in the yellow pages.
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