Question

a person covers a certain distance by traveliing at a uniform speed of 120km/h for 90 minutes. at what speed will he have to travel in ordr to cover the same distance in 1 hour 20 minutes? (in km/h)

Answer 1

Step-by-step explanation:

Speed=TimeDistance

Speed=45km/hr

Time=331hrs=10/3hrs

Distance=Speed×Time

Distance=45×310

Distance=15×10

∴Distance=150km

Now Speed=36km/hr

Time=SpeedDistance=36150=4366=4hrs and 10mins

Answer 2

Answer:

Step-by-step explanation:

speed = 120km/hr
Time taken = 90 min = (3/2)hr

cover distance = 120 * (3/2) = 180km

Speed required to cover 180KM in 1hr 20 minutes (4/3) hr = 180/(4/3) = 135km/hr