Question

The speed of boat downstream is 15 km/hr and the
speed of the stream is 1-5 km/hr. The speed of boxe
upstream is-
(A) 135 km/hr
(B) 16-5 km/hr
(C) 12 km/hr
(D) 8.25 km/hr​

Answer 1

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Let the speed of boat in still water be x km/hr

Let the speed of boat in still water be x km/hrThen, x + 1.5 = 15

⇒ x = 13.5

⇒ x = 13.5∴ Speed upstream = (13.5 - 1.5) km/hr = 12 km/hr

Answer 2

Lᴇᴛ ᴛʜᴇ sᴘᴇᴇᴅ ᴏғ ʙᴏᴀᴛ ɪɴ sᴛɪʟʟ ᴡᴀᴛᴇʀ ʙᴇ x ᴋᴍ/ʜʀ.

Tʜᴇɴ,

x + 1.5 = 15

⇒ x = 13.5

∴ Sᴘᴇᴇᴅ ᴜᴘsᴛʀᴇᴀᴍ

= ( 13.5 - 1.5 ) ᴋᴍ/ʜʀ

= 12 ᴋᴍ/ʜʀ

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