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10.7 Seconds

10.8 Seconds

10.9 Seconds

11.8 Seconds

B. 10.8 Seconds

Relative Speed = 60+40 = 100 Kmph

= 100*(5/18) = 250/9 m/sec

Distance to be covered = 140 + 160 = 300 metres

Time = Distance/Speed

$Time=300\times \frac{9}{250}=\frac{54}{5}\phantom{\rule{0ex}{0ex}}=10.8Seconds$