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Car speed = 70km/h
Car X |——————————|———————>| Y
1300 1600 1800
<——?——-><— 10—–>
Lorry X |<—————|————-|———————-| Y ? 1600 1300
Lorry average speed = ?
(a) Distance travelled by car from X to Y = 70 x 5 = 350
Distance travelled by car up to 1600 = 70 x 3 = 210
Remaining distance lorry needs to travel to X = 210 – 10 = 200
Distance travelled by lorry = 350-200 = 150
Time taken for that distance = 3
Therefore, average speed of lorry = 150/3 = 50km/h
(b) Time taken to reach X for lorry = 200/50 = 4
Hence Lorry will reach X at 1600+ 4h = 2000
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