To cover a distance of 240 km has to increase a speed of 5 per hour to reach in time time. If the time Lost was 40 minutes during traffic find the original speed

Question

Mathematics

Skylar Johnson

9 June, 01:11

To cover a distance of 240 km has to increase a speed of 5 per hour to reach in time time. If the time Lost was 40 minutes during traffic find the original speed

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Answers (1)

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Mara · Answer 1

The initial speed is approximately 104.3 km

Step-by-step explanation:

Let Distance = 240 km

Time = ?

Speed =

Since

Speed = Distance/Time

Distance = Speed * Time

When arrival is late:

240 = S*T

When arrival is on time:

240 = (S+5) * T2

But 40minutes = 2/3 hours

So,

T2 = T - 2/3

240 = (S+5) * (T - 2/3)

240 = ST - 2S/3 + 5T - 10/3

ST - 2S/3 + 5T = 240 + 10/3

S (T - 2/3) + 5T = 730/3

S (T - 2/3) = 730/3 - 5T

S = (730/3 - 5T) / (T - 2/3)

But 240 = ST

S = 240/T

240/T = (730/3 - 5T) / (T - 2/3)

(T - 2/3) / T = (730/3 - 5T) / 240

1 - 2/3T = 730/720 - 5T/240

1 + 73/72 = (2/3 + 5/24) T

145/72 = (7/8) T

T = 145/72 * 8/7

= 1160/504

T = 145/63

S = 240/S

= 240*63/145

= 3024/29

≈ 104.3km