A student reaches her school in 20 minutes with an average speed of 12 km per hour. If she wants to reach her school 8 minute earlier..Her speed should be??
A) 8km/h
B) 12km/h
C) 20km/h
D) 15km/h
A) 8km/h
B) 12km/h
C) 20km/h
D) 15km/h
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Step-by-step explanation:
Option B) 20 km/h
Hope it will be Helpful Ren ;)
➽ Distance to be travelled = Speed × Time
= 12 × (20/60)
= 12 × (20/60)= 4 kms
If he needs to reach 8 minutes earlier, time = 20 - 8 = 12 minutes = (12/60) hours
Speed= Distance/Time
= 4/(12/60)
= 4 × 5
⇛ 20 km/hr
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