Question

(c) 7 m
(d) 9 m
A car covers 30 km at a uniform speed of 60 km h- and the next 30 km at a uniform speed of 40 km h. Find the
total time taken.
(a) 30 min
(b) 45 min
(c) 75 min
(d) 120 min
​

Answer 1

Answer:

c) 75 min

Explanation:

first the speed is 60km per hour means that 10km will take 10 mins . So 30km will take 30min.

next the speed is 40km per hour means that 10km will

take 15min .So 30 min will take 45min .

Now we add the total time .

30min + 45min = 75mins

Answer 2

Answer:

Correct answer is= (c) 75 min

Explanation:

Distance d= 30km

Speed s = 60km

Time t = distance/speed

= 30/60=1/2 hr

Distance D2= 30km

Speed S2= 40km

Time T2= distance/speed

= 30/40= 3/4hr

Total Time = T1+T2= 1/2 + 3/4= 5/4hr

= 5*60/4= 75min