Two trains- each of length 125metre- are running in parallel tracks in opposite directions- One trains is running a speed 65km-hour and they cross each other in 6 seconds- The speed of the other train is-75km-hour85km-hour95km-hour105km-hour

Question

Toppr Admin · Accepted Answer

Let speed of secondtrain-xA0- - x km-hrtime - l1-l2Relativespeedinopp-direction-xA0-6-125-125-65-x-5186-250-xD7-18-65-x-565-x-50-xD7-3-xA0-x - 150 - 65-xA0-xA0-x - 85 km - hr-

Two trains, each of length 125metre, are running in parallel tracks in opposite directions. One trains is running at a speed 65km/hour and they cross each other in 6 seconds. The speed of the other train is:75km/hour85km/hour95km/hour105km/hour

Let speed of secondtrain = x km/hrtime = l1+l2Relativespeedinopp.direction. 6=125+125(65+x)5186=(250×18)(65+x)565+x=50×3 x = 150 - 65 x = 85 km / hr.

Let speed of second
train = x km/hr
time = $\frac{l_{1} + l_{2}}{R e l a t i v e s p e e d i n o p p . d i r e c t i o n .}$
$6 = \frac{125 + 125}{(65 + x) \frac{5}{18}}$
$6 = \frac{(250 \times 18)}{(65 + x) 5}$
$65 + x = 50 \times 3$
x = 150 - 65
x = 85 km / hr.