Question

A car is travelling at 40kilometre perhour

A how long does it take to travel 7KM

B how does it travell in 7 minutess

Answer 1

Step-by-step explanation:

If it takes 60 mins to travel 40kms, it takes 33 mins to travel 22kms.

You can find it out as follows:

40kms in 60 min= 22kms in 'x' min

40/60=22/x (cross multiplication)

=>(40*x)/60= 22

=> x= (22*60)/40

=> x= 1320/40

=> x= 33

Since ‘x' is time measured in units- “mins”, the answer is 33mins.

It takes 33mins to travel 22kms when travelling at a speed of 40kms per hour.

Proof: speed = distance/time

Distance= 22kms

Time obtained from above solution to travel 22kms = 33 mins

=> Speed = 22/(33/60) km/hour

{time to be taken in hours}

=> Speed = (22*60)/33 km/hour

=> Speed = 40km/hour {as given in the question}

Hence proved.

Answer 2

Step-by-step explanation:

Given:

A car is travelling 40 kilometre per hour.

Required to Find:

A. Time taken to travel 7 km.

B. Distance travel in 7 minutes.

Solution:

We know that, 1 hr = 60 min.

∵ Car is travelling 40 km in 1 hr i.e. 60 min.

$Time taken to travel 7 km=\frac{60*7}{40}min\\=\frac{21}{2}min\\=10.5min$

∴ Time taken to travel 7 km = 10.5 min

Now,

In 60 min car travels 40 km.

$In 7 min car travels=\frac{40*7}{60}km\\=\frac{14}{3}km\\=4\frac{2}{3}km$

∴In 7 min car travels = $4\frac{2}{3}km$

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