Two persons start from A and B and travel towards B and A, respectively. Their speeds are integral values and in the ratio 3:5.If they meet exactly 1.5hr after they start, which of the following can't be the distance AB?
A. 120km. B. 32km. C. 48km. D. 72km
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Answer:
32 km
Step-by-step explanation:
Let speed of A = 3x
let speed of B = 5x
As they are moving in opposite directions , their relative speed = 3x+5x
= 8x
time = 1.5 hr
distance = relative speed × time
= 8×1.5x = 12x
As x is an integer ,
therefore , distance is a multiple of 12
Clearly 32km can't be the distance as x would become 2.5
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