Question

5. Express the speed of 120 m per minute in km per
6. The speed of the train is 144 km per hour. Find its speed in metre per second.
7. Find out the distance covered when speed is 480 km/hour and time is 110 minu
8. A man runs at the speed of 20 km/hr. How much time will he take to cover 150​

Answer 1

Answer:

Q-5 ⟼ Express the speed of 120 m per minute in km per.

Speed = 120mt/min

$1 \: mt = \frac{1}{1000} \: \: \: \: \: 1 \: mm \:= \frac{1}{60}$

Speed in km/hr will be -

$\frac{120}{1} \times \frac{60}{1000}$

$\frac{36}{5} = 7.2 \: km \: per \: hr$

Q-6 ⟼ The speed of the train is 144 km per hour. Find its speed in metre per second.

$144 \: km = 144 \times 1000 \: m \\ 1 \: hr = 60 \times 60 \: seconds$

$⟼ 144 \: km \: per \: hr$

$= \frac{144 \times 1000}{60 \times 60} \: metre \: per \: second$

$= 40 \: metre \: per \: second$

Q-7 ⟼ Find out the distance covered when speed is 480 km/hour and time is 110 min.

$Speed \: ⟼ \: 480km \: per \: hr \: \:$

$Time = 110 \: min = \frac{110}{60} hrs$

$Distance⟼Speed \times Time = 480 \times \frac{110}{60} = 880 \: km$

Q-8 ⟼ A man runs at the speed of 20 km/hr. How much time will he take to cover 150.

Speed = 20 km/hr

We have to find Time taken to cover 1500 metres,

$1 \: km = 1000m \: \: \: 1 \: hr = 60 \: min$

$2000 \: metres \: travel \: in \: 60min \: \\ and \\ \: 1 \: m \: travel \: in \: \frac{60}{20000} min$

So,

$1500m \: travel \: in \: \frac{60}{20000} \times 1500min = 4.5min$

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