A) 27 km/h
B) 24 km/h
C) 25 km/h
D) 28 km/h
Correct Answer: A
Solution :
[a] Let the speed of the truck \[=x\text{ }km/h\] |
Relative speed of the bus \[=(45-x)km/h\] |
\[\therefore \] \[\text{Time}=\frac{\text{Speed}}{\text{Distance}}\] |
\[\frac{30}{60\times 60}=\frac{\frac{150}{1000}}{(45-x)}\] |
\[\Rightarrow \] \[\frac{1}{6}=\frac{3}{45-x}\]\[\Rightarrow \]\[45-x=18\] |
\[\Rightarrow \] \[x=45-18\]\[\Rightarrow \]\[x=27\,Km/h\] |
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