A starts from a place at a constant speed of 5 km/hr in a particular direction. After an hour B starts from
same place and over takes A after two and half hours. Calculate the speed of B?
Select one:
O a. 8km/hr
O b. 5km/hr
O c. 6km/hr
O d. 7km/hr
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Answer:
d
Step-by-step explanation:
speed = distance/time
distance traveled by A and B is equal
so s1×t1 = s2×t2
A: s1 is 5 kmph and takes t1=2.5hrs +1 hr = 3.5hrs
B: s2 and takes t2 =2.5hrs
5×3.5 = s2×2.5
s2 = 5×3.5/2.5 = 7 kmph
hope this helps
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