Two ship travelling at 30 km/hr and 90 km/hr head directly towards each other, they are 120 km apart at the starting time. How far apart are they (in km.) at one minute before they collide.
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60 minute –---------------------30km
1 minute –----------------------30÷60 km = 0.5km
thus, 1 minute goes 90÷60 = 1.5 km
ans. is 0.5 + 1.5 = 2 km.
1 minute –----------------------30÷60 km = 0.5km
thus, 1 minute goes 90÷60 = 1.5 km
ans. is 0.5 + 1.5 = 2 km.
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