A) 32 m/s
B) 27.5 m/s
C) 60 m/s
D) 30 m/s
Correct Answer: D
Solution :
Distance travelled by engine \[=v\times 5\,m=x\] Distance travelled by sound \[=900+(900-x)\] \[=(1800-x)m\] \[\Rightarrow \] \[{{v}_{sound}}=330\,m/s\] \[\Rightarrow \] \[v=\frac{\text{distance}}{\text{t}}\] \[330=\frac{(1800-x)}{5}\] \[1650=1800-x\] \[x=1800-1650\] \[x=150\,m\] Speed of engine \[=\frac{x}{5}=\frac{150}{5}=30\,m/s\]You need to login to perform this action.
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