Two men running towards each other at 4 m/s and 6 m/s respectively, are one km apart. how long will it take before they meet?

110 seconds

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101 seconds

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100 seconds

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1 minute and 40 seconds

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Solution

The correct options are
C
100 seconds

D
1 minute and 40 seconds

Speed = $\frac{D i s t a n c e}{T i m e t a k e n}$

Time taken = $\frac{D i s t a n c e}{S p e e d}$

Distance = 1 km = 1000 m

As the men are running towards each other, their combined speed will be = 4m/s + 6m/s = 10m/s

Hence, the time taken before they meet = $\frac{1000}{10}$ = 100 seconds

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Two men running towards each other at 4 m/s and 6 m/s respectively, are one km apart. how long will it take before they meet?

The correct options are C 100 seconds D 1 minute and 40 seconds Speed = DistanceTime taken Time taken = DistanceSpeed Distance = 1 km = 1000 m As the men are running towards each other, their combined speed will be = 4m/s + 6m/s = 10m/s Hence, the time taken before they meet = 100010 = 100 seconds