A car travels first 30 km at a uniform speed of 20 km /hr and went 30 km at a uniform speed of 40 km/hr
Find its average speed in km/hr

So, the time required by the car to cover 30km at the uniform speed of 40 km/hr is =3040 hours. Again, the time required to cover the last 30 km at the uniform speed of 20 km/hr is =3020 hours.

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weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

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