Question

make a mind map mentioning the limitations or disadvantages while making water purifier

system.​

Answer 1

Answer:

It takes 24 seconds for the train running at a speed of 42 km/hr to pass a man standing on a platform.

Step-by-step explanation:

To pass a man standing on the platform,

Distance travelled by the train = 280 m.

Speed of the train = 42 km/hr. =\frac{42 \times 1000}{60 \times 60} \mathrm{m} / \mathrm{s}

60×60

42×1000

m/s = 35/3 m/s.

The mathematical formula to find the time taken by the train to pass a man on the platform is,

\bold{=\frac{\text {Distance travelled by the train}}{\text {Speed of the train}}}=\frac{280 \mathrm{m}}{\frac{35 \mathrm{m}}{3 \mathrm{s}}}=\frac{280 \times 3}{35}=

Speed of the train

Distance travelled by the train

=

3s

35m

280m

=

35

280×3

= 24 s.

Hence, in 24 seconds the train crossed