A cyclist is moving at a speed 20km/h for 20 minutes . By how much should he increase his speed if he needs to cover the distance in 15 minutes
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Distance travelled in 1 hour (60 minute) is 20 km.
∴ The distance travelled in 20 minute
=20/60*20
=20/3km
If this distance is covered in 15 minutes
speed=20/3km÷15/60hr
=80/3km/hr
increase in speed=80/3-20=20/3km/hr.
thankyou
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