The speed of a boat in still water is 17.5 km/h and the rate of the current of the stre
is 2.5 km/h. Find the distance travelled downstream in 24 minutes 120?
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Step-by-step explanation:
130 km
Description for Correct answer:
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
[ ∵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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