Question

Alpha and Beta are two friends. Alpha start with his bike at the speed of 60 kmph. Beta starts with his car at the speed of 80 kmph from the same place, in the same direction but after one hour. After how many hours they will meet?
1. 1 hour
2. 2 hour
3. 3 hour
4. 4 hour

Answer 1

Correct Answer - Option 3 : 3 hour

Given∶

Speed of Alpha = 60 kmph

Speed of Beta = 80 kmph        

Formula Used∶

Time = Distance / Speed

Calculation∶

Distance covered by Alpha in 1 hour = 60 km

Beta starts after 1 hour, he is driving with the speed of 80 kmph

Relative speed of Alpha and Beta = 80 kmph – 60 kmph = 20 kmph

Hence, they will meet in = Distance covered by Alpha / Relative speed = 60 / 20 = 3 hr.

∴ Alpha and Beta will meet after 3 hours.