Two trains 11

Two trains running in opposite direction cross a man standing on the platform in 27 seconds and 17 seconds and they cross each other in 23 seconds. Find the ratio of their speeds.

Correct answer:

r =  3:2

Step-by-step explanation:

t1=27 s t2=17 s t3=23 s  t1 = l1/v1 t2 = l2/v2  t3 =  v1+v2l1+l2  t3 =  v1+v2t1v1+t2v2  t3(v1+v2) = t1v1+t2v2 t3v1+t3v2 = t1v1+t2v2 t3v1  t1v1 = t2v2t3v2  v1(t3t1) = v2(t2t3)  r = v1/v2 =  t3t1t2t3   r =  t3t1t2t3  r=t1t3t3t2=27232317=1.5=3:2



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