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Two cars P and Q are moving in a racing track continuously for two hours. Assume that no other vehicles are using the track during this time. The expressions relating the distance travelled $d$ (in km) and time $t$ (in hour) for both vehicles are given as

P: $d=60 \: t$

Q: $d=60 \: t^2$

Within the first one hour, the maximum space headway would be

  1. $15$ km at $30$ minutes
  2. $15$ km at $15$ minutes
  3. $30$ km at $30$ minutes
  4. $30$ km at $15$ minutes
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