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$Relativespeed=(60+90)km/hr\phantom{\rule{0ex}{0ex}}=\left(150x\frac{5}{18}\right)m/sec\phantom{\rule{0ex}{0ex}}=\left(\frac{125}{3}\right)m/sec.\phantom{\rule{0ex}{0ex}}Dis\mathrm{tan}cecovered=(1.10+0.9)km=2km=2000m.\phantom{\rule{0ex}{0ex}}Requiredtime=\left(2000x\frac{3}{125}\right)sec=48sec.$