Question
A motorboat in still water travels at a speed of 39
km/hr. It goes 35 km upstream in 1 hour 15 minutes. The time taken by it to cover the same distance down the stream will be :Solution
Speed of the motorboat upstream = 35/(5/4) = 28 km/hr Let the speed of the current be x km/hr ⇒ 39 – x = 28 ⇒ x = 11 km/hr Speed of motor boat downstream = 39 + 11 = 50 km/hr Time taken to cover 35 km at 50 km/hr = 35/50 = 7/10 hours or 42 minutes
Find the unit digit in (257)45 × (248)73.
A Student was asked to add 8 and subtract 5 from a number. By mistake, he added 5 and subtracted 8. If his answer is 11, what should be the correct answer?
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Which term of the arithmetic progression 88, 90, 92, 94... is 142?
15Â Â Â Â Â Â Â Â Â Â 15Â Â Â Â Â Â Â Â Â Â 60Â Â Â Â Â Â Â Â Â Â 540Â Â Â Â Â Â Â Â 8650
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