the speed of a motar boat in still water is 175 km per hour if the speed of the stream in 5.5 km per hour determine a. the time taken by the boat to go 103.5km downstream b. the time taken by the boat to go 39km up stream
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Answer:
hii
Explaination:
Rate downstream of boat = 17.5 + 2.5 = 20 kmph
Rate upstream of boat = 17.5 - 2.5 = 15 kmph
Distance XY = x km.
∴ Distance YZ = 2x5 km.
Total time = 429 minutes
= 7320 hours = 14320 hours
∴x20+2x5×15=14320
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[ ∵DistanceSpeed=Time ]
=> x4+2x15=1434
=> 15x+8x60=1434
=> 23x=143×15
=> x = 143×1523 = 93 km.
∴ Total distance = x + 2x5=7x5
= 7×935 = 130 km.
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