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jai

· started a discussion

· 1 Months ago

Wrong answer and solution (Question: 121647.0 )

Speed of train A is given not the speed of train B.

Question:

Two trains A and B left towards each Other from two different stations. After crossing each other, both trains A and B reached their destination within 5\(\cfrac{1}{7}\) h and 9\(\cfrac{1}{7}\)h respectively. If the speed of train B is 54 km/h, then find out the speed of train A.

Options:
A) 81 km/h
B)

65 km/h 


C) 60 km/h
D) 72 km/h
E) None of these
Solution:
Ans: (d)

Let the speed of Train A = SA and time taken by Train A = 5\(\cfrac{1}{7}\) h

Speed of Train B = 54 km/h and time taken by Train B = 9\(\cfrac{1}{7}\) h


SA= \(\cfrac{8 × 54}{6}\) =72 km/h

Knowledge Expert

· commented

· 1 Months ago

If the speed of train B is 54 km/h, then find out the speed of train A.
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