Correct Answer: 36 kmph
Explanation:
Let the speed of goods truck be 'p' kmph
 Distance covered by goods truck in 10hrs (4+6) = Distance covered by other truck in 4 hrs. 
 10p = 4 x 90
 p = 36kmph.
 Therefore, the speed of the goods truck is p = 36 kmph.
Discussion & Comments