A car is travelling at a rate of 70 km per hour leaves the house 2 hours after a truck has left and overtakes it in 5 hours. At what rate was the truck travelling?

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Answer 1 · 2017-07-23T14:46:14

The speed of the truck is #=50kmh^-1#

Let the speed of the truck be #=vkmh^-1#

The distance travelled by the truck is

#d=v*7=7v km#

The distance travelled by the car is

#d=5*70=350km#

Therefore,

#7v=350#

#v=350/7=50kmh^-1#