Question

A car covers 30 km at a uniform speed of 60 km/hr and the next 30 km at 40 km/hr. Find the total time taken.​

Answer 1

Explanation:

Distance D1=30km

speed s1= 60km/hr

time= 30/60 = 1/2hr

distance D2=30km

speed s2=40km/hr

time t2=30/40= 3/4hr

total time =t1+t2 =1/2+3/4=5/4hr

Average speed=total distance/total time

=30+30/5/4

=48km/hr

Answer 2

$\bf\underline \blue {To \: \mathscr{f}ind:-}$

• we need to find Total time taken by car to cover whole journey.

$\huge\bf\underline \green{ \mathcal{S}olution...}$

$\bf\underline{\purple{Given:-}}$

Case 1st :-

✫ Car cover 30 km with a uniform speed of 60km/hr.

we know that,

$\huge\star \: \bf \red{time \: = \frac{distance}{speed} }$

So,

• Speed = 60km/hr
• Distance = 30km

↛ Time taken = 30/60

↛ Time taken = 1/2 hr

Case 2nd :-

After that the car covers next 30 km at 40 km/hr.

• Speed = 40km/hr
• Distance = 30km

↛ Time taken = 30/40

↛ Time taken = 3/4 hr

• Total time taken by car :-

= 1/2 + 3/4

= (2 + 3)/4

= 5/4 hr.

Hence,

• Total time taken by car = 5/4 hr

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