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Lee and Bryan runs at a speed of 30 km/h and 20 km/h. They participate in a race of 300 km. Bryan seeing that he is losing the race increase its speed by 20 km/h. They reach at the end at the same time. Find the time when Bryan increase its speed.

Lee and Bryan runs at a speed of 30 km/h and 20 km/h. They participate in a race of 300 km. Bryan seeing that he is losing the race increase its speed by 20 km/h. They reach at the end at the same time. Find the time when Bryan increase its speed. Correct Answer 5 Hour

Given:

Lee Speed = 30 km/h

Bryan Speed = 20 km/h

Formula used:

Distance = Speed × Time

Concept:

Distance travel is same in same time, we can solve the question by using the basic form of Distance formula.

Calculation:

Let Lee can complete the total distance in Time

Lee’s Time = Distance/Speed

Lee’s Time = 300/30

Lee’s Time = 10 Hour

Let suppose Bryan change its speed after Time T.

20 × T + 40 × (10 – T) = 300

⇒ 20T + 400 – 40T = 300

⇒ 20T = 100

⇒ T = 100/20

⇒ T = 5 Hour

∴ Bryan change its speed after 5 Hour

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