A man can row his boat with the stream at 5 km per hour and against the stream at 31/2 km per hour. how much distance he can going his boat in a lake(still water) in 2 hours?
Answers
Answered by
0
Step-by-step explanation:
Let Distance be =D
Speed in upstream=14−10=4 km/hr
Speed in downstream=14+10=24
Time =
S
D
According to question
4
D
+
24
D
=4
24
7D
=4⇒=
7
96
=13.71km
Answered by
6
Answer:
8.5 km
Step-by-step explanation:
Formula used:
speed of boat in still water=1/2( downstream speed+ upstream speed)
=> downstream speed= 5 km/h
upstream speed = 7/2 km/h
using the formula mentioned above, we get
speed of boat in still water= 1/2( 5+7/2)
= 1/2 ( 17/2)
= 4.25 km/h
let distance traveled be x,
time given= 2 hours
=> 4.25= x/ 2 {speed=distance/time}
x => 8.5 km
ANSWER: 8.5 km
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