Question

Two athlete starts a race together, Bolt at 7 kmph and Jordan at 6 kmph. Bolt arrives 30 min before Jordan. What is the distance they both have to complete?
1. 21 km
2. 31 km
3. 12 km
4. 13 km

Answer 1

Correct Answer - Option 1 : 21 km

Given∶

Speed of Bolt = 7 kmph

Speed of Jordan = 6 kmph

Bolt finish the race 30 min before Jordan.

Formula Used∶

Time = Distance / Speed

Calculation∶

Let the distance covered to finish the race be x km.

Bolt finish the race 30 min before the Jordan finish.

Time difference = Time taken by Bolt – Time taken by Jordan

⇒ 1 / 2 = (x / 6) – (x / 7)

⇒ 1 / 2 = (7x – 6x) / 42

⇒ x = 42 / 2 = 21 km

∴ The distance that they both have to cover to finish the race is 21 km.