A student walks from his house at a speed of K per hour and reaches his school 6 minutes late. The next day he increases his speed by 1 km per hour and reaches 6 minutes before school time. How far is the school from his house?
Created: 6 months ago |
Updated: 5 months ago
best des
Total distance = D
& speed=s
D/(5/2s)-6/60 =D/(7/2s) +6/60
=>2D/5 -2D/7=12/60
=>(14D-10D)/35=1/5
=>D=35/20
=>D=7/4 or 1 (3/4) km.
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