Q A boat moves downstream at the rate of 8 kmph and upstream at a rate of 5 kmph The

speed of boat in still water = (5+8)/2=>6.5kmph
12 years agoHelpfull: Yes(9) No(2)
let flow of stream is v
boat velocity is "b"
b+v=8 DOWN STREAM(stream velocity is in same direction of boat velocity)
b-v=5 UPSTREAM(opposite direction)
solving b=6.5
11 years agoHelpfull: Yes(3) No(0)
a+b=8
a-b=5
2a=13
a=6.5
11 years agoHelpfull: Yes(2) No(0)
1/2 *(a+b)
a=8,b=5

13/2 =6.5 kmph
11 years agoHelpfull: Yes(1) No(2)
6.5
avg = 8+5/2 = 6.5
11 years agoHelpfull: Yes(1) No(0)
8+5/2=6.5 kmph
11 years agoHelpfull: Yes(0) No(1)
6.5 kmph..is the ans
11 years agoHelpfull: Yes(0) No(0)
u+v=8
u-v=5
-----------
2u=13
u=13/2
u=6.5
9 years agoHelpfull: Yes(0) No(0)
(8+5)/2=6.5
8 years agoHelpfull: Yes(0) No(0)
u+v=8,u-v=5 so u=6.5
8 years agoHelpfull: Yes(0) No(0)
ans =6.5kmph
(8+5)/2=6.5kmph
8 years agoHelpfull: Yes(0) No(0)
Speed of still water= 1/2(a+b)
=1/2(8+5)=6.5
8 years agoHelpfull: Yes(0) No(0)
downward speed(a)=8, upward speed(b)=5
still water =1/2(a+b)=1/2(8+5) =6.5kmph
8 years agoHelpfull: Yes(0) No(0)
Vboat +Vstream = 8kmph
Vboat - Vstream = 5kmph

Vboat = 6.5 kmph thus B
7 years agoHelpfull: Yes(0) No(0)
6.5 kmph
U-v=5
U+v=8
7 years agoHelpfull: Yes(0) No(0)
speed of boat in still water =( 8+5)/2=6.5
7 years agoHelpfull: Yes(0) No(0)

Q. A boat moves downstream at the rate of 8 kmph and upstream at a rate of 5 kmph. The speed of the boat in still water is?

Option
a) 6 kmph
b) 6.5 kmph
c) 7 kmph
d) 7.5 kmph