Question

A boat whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is: ( 4,5,6,10) is the choice answers
and imma ask a couple more questions im sorry

Answer 1

Step-by-step explanation:

Formulae For Speed

S = d/t

The Distanc covered was 30km

Time taken was 4 hours 30 minutes

S = 30/4.5

S = 6.77 (Round Off) 6

6 Is The Answer

Answer 2

Answer:

answer is 5 km/hr

Step-by-step explanation:

the speed of the stream be x km/hr

Then,

Speed downstream = (15 + x) km/hr

Speed upstream = (15 - x) km/hr

∴30/(15+x)+30/(15−x)=

$4 \times \frac{1}{2}$

⇒900/(225−x2)=9/2

⇒9x2=225

⇒x2=25

⇒x=5km/hr