Hurry - rush

At an average speed 7 km/h I will come from the school to the bus stop for 30 minutes. How fast I need to go if I need to get to the bus stop in 21 minutes?

Correct result:

v =  10 km/h

Solution:

v=7⋅ 30/21=10 km/hv=7 \cdot \ 30/21=10 \ \text{km/h}

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