in a 800m race,A defeated B by 15sec.IfA's speed was 8 km/ hour . what was B' s speeds?
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Answer:
Step-by-step explanation:
A's speed
= 8 km/hr
= (8×518)
m/sec
= 209
m/sec
Time taken by A to cover 800 m
= (800×9/20)
sec
= 360 sec
Time taken by B to cover 800 m
= (360 + 15) sec
= 375 sec
∴ Speed of B :
= 800375
m/sec
= (800375×185)
km/hr
= 192/25
km/hr
= 7 17/25
km/hr
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