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Jose's school is 4 km away. He walked 30 min at 5 km/hr when he realized he was running late and started running. How fast does he need to to make it to school before the bell rings in 15 minutes.

Sagot :

Answer:

Jose need to travel with a speed of [tex]6[/tex] Km/hr to reach school in 15  minutes before the bell rings.

Step-by-step explanation:

Total distance from home to School [tex]= 4[/tex] km

Distance travelled by Jose in first [tex]30[/tex] minutes is equal to

[tex]\frac{30}{60} * 5\\= 2.5[/tex]

Distance to travel in next [tex]15[/tex] minutes is equal to

[tex]4 -2.5 = 1.5[/tex] Km

Required speed

[tex]\frac{1.5}{\frac{15}{16} } \\= 1.5 * 4\\= 6[/tex]

Jose need to travel with a speed of [tex]6[/tex] Km/hr to reach school in 15  minutes before the bell rings.