A) 1 H
B) 2 H
C) 3 H
D) 5 H
Correct Answer: B
Solution :
[b] Let the truck travels for ?t? hour at 60 km/hr. \[\therefore \] \[60\times t+30\times (6-t)=240\] \[\Rightarrow \] \[60t+180-30t=240\] \[\Rightarrow \] \[30t=60\] \[\Rightarrow \] \[t=2\,hr.\] \[\therefore \] Truck travels 2 hours at 60 km/hr.You need to login to perform this action.
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