A) 3H
B) 2H
C) 5H
D) 1H
Correct Answer: B
Solution :
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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