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a body moves on to 120 km long track if he moves first 30 km with a speed of 30 km per hour then what is the speed for next 90 so that average speed becomes 60 km per hour​
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a body moves on to 120 km long track if he moves first 30 km with a speed of 30 km per hour then what is the speed for next 90 so that average speed becomes 60 km per hour​

User Ansh
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1 Answer

4 votes

Answer:

90 km/hr

Step-by-step explanation:

AVERAGE is 60 km/hr so 120 km / 60 km/hr = 2 hours total

first 30 km / 30 km / hr = 1 hour used 1 hour left

now there is 90 km to cover in the second hour

so that must be 90 km/hr

User Hcknl
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