Question

A train is moving at a uniform speed of 75km/hour.
a) How far will it travel in 20 minutes?
b) Find the time required to cover a distance of 250 km​

Answer 1

Answer:

A) 25km in 20 minutes

B) 250km in 200 minutes or 3 hours and 34 minutes

Answer 2

Given:

uniform speed of the train = 75 km/hr

To Find:

• distance covered by train in 20 mins

• times required to cover a distance of 250km

Solution:

1) it is given that the uniform speed of the train is 75 km/hour

therefore,

distance covered by the train in 1 hour = 75km

distance covered by the train in 60 mins = 75km

now,

distance covered by the train in 1 minute

$⟹$ $\sf{\frac{75 km}{60}}$

we have to find:

the distance covered by the train in 20 minutes

so, using unitary method,we get:

$⟹$$\sf{\frac{75 km}{60} × 20}$

$⟹$$\sf\underline\red{25 km}$

2) uniform speed of the train = 75km\hour

we can write it as:

time required to cover a distance of 75km = 1 hr

therefore,

time required to cover a distance of 1 km

$⟹$$\sf{\frac{1}{75}hour}$

using unitary method,we get:

time required by the train to cover a distance of 250km

$⟹$$\sf{\frac{1}{75} × 250km}$

$⟹$$\sf\underline\red{ 3\:hours\: 20\: minutes}$

Hence,

• distance covered by the train in 20 minutes is 25 kilometres

• time required by the train to cover a distance of 250 kilometres is 3 hours 20 minutes