Question

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.

Answer 1

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

Explanation:

Total distance from home to School
`= 4` km

Distance travelled by Jose in first
`30` minutes is equal to

`(30)/(60) * 5\\= 2.5`

Distance to travel in next
`15` minutes is equal to

`4 -2.5 = 1.5` Km

Required speed

`(1.5)/((15)/(16) ) \\= 1.5 * 4\\= 6`

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