Question

a boat goes 15km upstream in 80 minutes .the speed of the stream is 5km/hour .the speed of the boat still in water is​

Answer 1

Explanation:

Given :-

• Speed of Stream = 5 km/h
• Upstream Distance = 15 km
• Time Taken = 1 hours 20 minutes = 4/3 hours

Solution :-

☆ Let Speed of boat in Still Water = x km/h

Then, Upstream Speed = (5-x) km/h

We Know That

☆ Speed = Distance / Time

$\rightarrow \large \: \: x \: = \frac{15}{ \frac{4}{3} }$

$\rightarrow \large \: x = 20 \: km| h$

Speed of Boat in Still Water = 20 km/h

Thank You.

Answer 2

Answer:

16.25 km/hr

Explanation:

speed of the stream =5km/hr

speed of upstream =15km/hr

time taken =80min

=1hours 20min

= 4/3