Distance

Algebra Level 3

Vehicle A and vehicle B start to move in the opposite direction towards each other. The speed of A is 70 km/h 70\text{ km/h} and B, 50 km/h 50\text{ km/h} . How many kilometers was the distance between the two vehicles before 15 minutes the meeting?

Can not be determined 45 km 30 km 120 km

Utku Demircil by Utku Demircil , 24, Turkey

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2 solutions

Utku Demircil
Aug 13, 2016

Total speed = 70km/h + 50km/h = 120km/h = 30km/15min

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Chew-Seong Cheong
Aug 13, 2016

The distance between vehicle A and B at time t t after starting is: D = 70 t + 50 t = 120 t D = 70 t + 50 t = 120 t for t = 15 t = 15 minutes, we have D = 120 × 15 60 = 30 D=120 \times \dfrac {15}{60} = \boxed{30} km.

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