Two towns T 1 and T 2 are connected by regular bus service. A scooterist moving from T 1 to T 2 speed of 20 kmh -1 notices that a bus goes past it every 21 minute in the direction of his motion and every 7 minute in the opposite direction. If a bus leaves in either direction every 1 minute, the period t is
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But (say B 1 ) in the same direction relative speed of bus and cyclist, 
Distance traveled by B 1 relative of cyclist in 21 minutes 
Distance covered by bus in T minute 
Then 
But in the opposite direction (say 
)
Relative speed between 
and cyclist,
… .(i)
Distance traveled by B 2 relative to cyclist in 7 minutes 
Then 
… .(ii)
Frp, (i) and (ii)
Thus 
minute
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