A and B started travelling towards each other at the same time, from places X to Y and Y to X, respectively. After crossing each other, A and B took 2.45 hours and 4.05 hours to reach Y and X, respectively. If the speed of B was 8.4 km/h, then what was the speed (in km/h) of A?

10.8

Formula used :-

(\(\frac{Speed \;of\; A }{Speed \;of\; B}\))2 = \(\frac{Time \;of\; B }{Time \;of\; A}\)

(\(\frac{Speed \;of\; A }{8.4}\))2 = \(\frac{4.05 }{2.45}\)

= \(\frac{81 }{49}\)

(\(\frac{Speed \;of\; A }{8.4}\)) = \(\frac{9 }{7}\)

Speed of A = 10.8 km/h