Question 23.
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Marks : 1.00 Answer Mahesh'can swim in water at 12 km/hr in stil water. if the speed of the stream {S Skmihr, what will be the time taken by the Mahesh to go 68 km © 2Shours downstream? | | yA E y ‘ iste aes Leino Nf =e :: = SSa5 é Biss : - A) 3hours - B) 4hours - C) 35hours
Show answer & explanation
The downstream speed is the sum of the speed in still water and the speed of the stream. Dividing the total distance by this combined speed gives the time taken.
Step-by-step Derivation:
Step 1: Identify the given values. Speed of Mahesh in still water (u) = 12 km/hr. Speed of the stream (v) = 5 km/hr (interpreted from the fragmented text 'S Skmihr' as 5 km/hr, which is the standard value for this common problem type and fits the options). Total distance (d) = 68 km.
Step 2: Calculate the downstream speed. Downstream Speed = Speed in still water + Speed of stream = 12 km/hr + 5 km/hr = 17 km/hr.
Step 3: Calculate the time taken using the formula Time = Distance / Speed.
Time = 68 km / 17 km/hr = 4 hours.