Ram hears a sound of whistle after 2 sec. of whistling by Shyam and Shyam hears a sound of whistle a

M4maths Previous Puzzles

01 Oct 2015 Velocity

Ram hears a sound of whistle after 2 sec. of whistling by Shyam and Shyam hears a sound of whistle after 3 sec. of whistling by Ram. If Ram and Shyam are in the line of flow of wind, then velocity of wind in m/s is
(Given that the speed of sound is 300 m/s)

OPtion

1) 80
2) 50
3) 40
4) 30
5) 60
6) 90
7) Wind is not blowing
8) Data are insufficient
9) 70
10) 20

Solution

Ram hears a sound of whistle after 2 sec. of whistling by Shyam and Shyam hears a sound of whistle after 3 sec.
(greater than 2 sec.) of whistling by Ram. These data indicate that wind is blowing from Shyam to Ram
According to first condition l = (300 + x) 2,
l represents distance between them
According to second condition l = (300 – x) 3
On solving these equations, we get x = 60

Correct Option: 5 Best Solution (9)

Moutam Vishnu Murthy   9 years AGO

If D is distance between the, s is speed of sound and w is speed of wind, then.........

D/( s+w) = 2 and D/(s-w) = 3
hence D= 2*( s+w)= 3*(s-w) ... s= 5w

Hence speed of wind =s/5 = 300/5= 60 m/sec..option 5

Like? Yes (2) | No   

H. Sreekanth   9 years AGO

Ram hears a sound of whistle after 2 sec. of whistling by Shyam and Shyam hears a sound of whistle after 3 sec.
(greater than 2 sec.) of whistling by Ram. These data indicate that wind is blowing from Shyam to Ram
According to first condition l = (300 + x) 2,
l represents distance between them
According to second condition l = (300 - x) 3
On solving these equations, we get x = 60

Like? Yes (1) | No   

TAUSEEF AMEEN   9 years AGO

(300+x)/3 = (300-x)/2
900-3x=600+2x
x=60

Like? Yes (1) | No   

MADHUBABU   9 years AGO

Ram hears a sound of whistle after 2 sec. of whistling by Shyam and Shyam hears a sound of whistle after 3 sec.
(greater than 2 sec.) of whistling by Ram. These data indicate that wind is blowing from Shyam to Ram
According to first condition l = (300 + x) 2,
l represents distance between them
According to second condition l = (300 � x) 3
On solving these equations, we get x = 60

Like? Yes (1) | No   

DHAYYALA SREEKANTH REDDY   9 years AGO

Ram hears a sound of whistle after 2 sec. of whistling by Shyam and Shyam hears a sound of whistle after 3 sec.
(greater than 2 sec.) of whistling by Ram. These data indicate that wind is blowing from Shyam to Ram
According to first condition l = (300 + x) 2,
l represents distance between them
According to second condition l = (300 - x) 3
On solving these equations, we get x = 60

Like? Yes (1) | No   

RANJAN FADIA   9 years AGO

let speed of wind is z m/sec.
then equation will be
note it that wind is blowing from shyam to ram due to time taken is 3 sec. which is greater than 2 sec due to oppose of wind.
(300-z)3 = (300+z)/2
900-3z=600+2z
z=60 Ans.

Like? Yes (1) | No   

premlata   9 years AGO

Given data indicate that wind is blowing from Shyam to Ram

Let D: distance between them
According to first condition D= (300 + x) * 2,

According to second condition D = (300 - x) * 3
On solving these equations, we get x = 60 m/s

Like? Yes (1) | No   

Pesari Udayasree   9 years AGO

If D is distance between the, s is speed of sound and w is speed of wind, then.........

D/( s+w) = 2 and D/(s-w) = 3
hence D= 2*( s+w)= 3*(s-w) ... s= 5w

Hence speed of wind =s/5 = 300/5= 60 m/sec..option 5

Like? Yes (1) | No   

s.h.h.praveen   9 years AGO

relative time=2+3=5(same direction)
speed of sound in air=300,
velocity of wind =300/5=60

Like? Yes (1) | No