the speed of a moter boat in still water is 17.5 km h-1 if thr speed of stream is 5.5km/h-1 determine the
(a) time taken by the boat to go 103 km downstrem
(b)the time taken by the boat to go 39 km downstream
Answers
Answered by
1
Answer:
A) 130 km
Explanation:
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 = 2x52x5 km.
Total time = 429 minutes
= 73207320 hours = 1432014320 hours
∴x20+2x5×15=14320∴x20+2x5×15=14320
[ ∵DistanceSpeed=Time∵DistanceSpeed=Time ]
=> x4+2x15=1434x4+2x15=1434
=> 15x+8x60=143415x+8x60=1434
=> 23x=143×1523x=143×15
=> x = 143×1523143×1523 = 93 km.
∴∴ Total distance = x + 2x5=7x52x5=7x5
= 7×9357×935 = 130 km.
Answered by
1
Answer:
its 130km
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