Question

a truck 10 m long enters three tunnels with lengths 170m,158m,210m and exits through the other end after 14.4s,7.4s and 35s respectively.what is the average speed of truck in km/h​

Answer 1

The average speed of truck is 33.84 km/hr

Solution:

The average speed is given as:

$Average\ speed = \frac{total\ distance}{total\ time}$

From given,

Total distance = 170 + 158 + 210 = 538 meter

Total time = 14.4 + 7.4 + 35 = 56.8 seconds

Thus,

$Average\ Speed = \frac{538}{56.8} = 9.4\ m/s\\\\Convert\ to\ km/hr\\\\Average\ Speed = 9.4 \times \frac{18}{5} = 33.84\ km/hr$

Thus, average speed of truck is 33.84 km/hr

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Answer 2

Given :

• A truck 10 m long enters three tunnels with lengths 170m, 158m, 210m and exits through the other end after 14.4s, 7.4s and 35s respectively.

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Find :

• What is the average speed of truck in km/h?

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Formula :

★ Average speed = Distance/Time.

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Calculations :

• Finding the Distance and Time:

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→ Distance = 170 + 158 + 210

→ Distance = 538 meters

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→ Time = 14.4 + 7.4 + 35

→ Time = 56.8 seconds

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• Finding the Average distance:

→ Average speed = 538/56.8

→ Average speed = 9.4 m/s

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Remember/Note :

• As per the given question we have to find the average speed of the truck in kilometer by hour.

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→ Average speed = 9.4 × 18/5

→ Average speed = 9.4 × 3.6

→ Average speed = 33.84 km/hr

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Therefore, 33.84 km/hr is the average speed of the truck.