Asked by ahujarajesh11 | 20th Jun, 2015, 12:51: PM

Expert Answer:

begin mathsize 12px style Time space taken space by space the space train space to space travel space 30 space km space at space speed space of space 30 space km divided by straight h space is space given space as comma straight v equals straight d over straight t straight t equals straight d over straight v equals fraction numerator 30 space km over denominator 30 space km divided by straight h end fraction equals 1 space straight h Time space taken space by space the space train space to space travel space entire space trip space with space average space speed space 60 space km divided by straight h space is space given space as comma straight t equals fraction numerator 120 space km over denominator 60 space km divided by straight h end fraction equals 2 space hr hence comma space time space taken space to space travel space 90 space km space distace space would space be equals space left parenthesis 2 minus 1 right parenthesis equals 1 space straight h therefore comma space speed space for space 90 space km space equals space 90 over 1 equals 90 space km divided by straight h end style

Answered by Priyanka Kumbhar | 20th Jun, 2015, 02:21: PM