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Answer

Truck speed → s

Truck travelling time → 55mins = 11/12 h

Car speed → s + 40

Car travelling time → 10mins = 2/12 h

Distance travelled by both are same

11/12 s = 2/12 (s + 40)

11s = 2s + 80

9s = 80

s = 8/9 km/h

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2.50 pm ——- 45 min ——- 3.35 pm
2.50 pm to 3.45 pm ——- 55 min (time taken by truck)
3.35 pm to 3.45 pm ——- 10 min (time taken by car)

speed of truck x 55/60 ——- (speed of truck + 40) x 10/60
speed of truck ——- 400/(55 – 10) = 8 8/9

Ans : 8 8/9 km/h

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