The ratio between the speed of the boat in still water to a speed of the stream is 8: 1. If 67.5km is traveled downstream in 2.5 hours then find the difference between the speed of the boat in still water to speed of stream(in kmph)?

1:

15

2:

3

3:

24

4:

21

5:

17.5

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SBI Clerk Prelims 2018

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