Solve the word problem.
A train travels at $55 km / h$ and covers a certain distance in $7$ hours. How long will it take for this train to travel the same distance at a speed of $77 km / h$ ?

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Solution

Unitary method
At the speed of $55 km / h$ , the train takes $7 h$ to cover a certain distance.
At the speed of $1 km / h$ , the car will take more time to travel the distance, so we multiply.
$∴$ At $1 km / h$ , the train takes $=$ $(55 \times 7) h$
At the speed of $77 km / h$ , the car will take less time to travel the distance, so we divide.
$∴$ At $77 Km / h$ , the train takes $= \frac{55 \times 7}{77} = 5 h$
Hence, it takes $5 h$ for a train to travel the same distance at a speed of $77 km / h$ .

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Solve the word problem.A train travels at 55km/h and covers a certain distance in 7 hours. How long will it take for this train to travel the same distance at a speed of 77km/h?

Solve the word problem.
A train travels at $55 km / h$ and covers a certain distance in $7$ hours. How long will it take for this train to travel the same distance at a speed of $77 km / h$ ?