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Two cars start towards each other, from two places A and B which are at a distance of 160 km. They start at the same time 08 ∶ 10 AM. If the speeds of the cars are 50 km per hour and 30 km per hour respectively, they will meet each other at1. 10 ∶ 10 AM2. 10 ∶ 30 AM3. 11 ∶ 10 AM4. 11 ∶ 20 AM |
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Answer» Correct Answer - Option 1 : 10 ∶ 10 AM Given: The distance between A and B = 160 km Speed of car1 = 50 km per hour Speed of car2 = 30 km per hour Concept used: If two trains are moving in opposite directions at u m/s and v m/s, then relative speed is = (u + v) m/s Formula used: Time = Distance/Speed Calculation: Relative speed = (speed of car1 + speed of car2) ⇒ Relative speed = (50 + 30) = 80 km/hr ⇒ Time = Distance/Time ⇒ Time = 160/80 = 2 hours They start at the same time 08 ∶ 10 AM ⇒ Time = 08 ∶ 10 AM + 2 = 10 : 10 AM ∴ They will meet each other at 10 : 10 AM |
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